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From an extensive series of trials involving approximately 15 000 Romney ewes mated with 435 rams, provisional results are presented on the comparative performance of 14 sire breeds for lamb meat production. The breeds, each represented by ten or more rams, were Southdown, Suffolk, South Suffolk, Hampshire, Dorset Down, South Dorset Down, Poll or Horn Dorset, Border Leicester, English Leicester, Ryeland, Cheviot, Lincoln, Merino and Romney.Important differences exist between sire breeds in progeny survival, with the Southdown being best and the Romney poorest. Progeny of long-wool sires, and particularly the Lincoln, clip more wool at post-weaning shearing than of the Down breeds, which exhibit quite small variation.Sire breeds vary in average live-weight and carcass growth of their progeny, the Suffolk, Hampshire and Dorset breeds producing the heaviest and Merino and Romney the lightest lambs. In terms of lamb live-weight or carcass production per Romney ewe mated, Romney, Merino, Lincoln, Ryeland, Cheviot and English Leicester sires are inferior to the Southdown while Dorset, Suffolk, South Suffolk and Dorset Down are superior.Within any breed, wide differences exist between progeny growth rates of the best and poorest sires, emphasising the importance of sound selection of rams and of adequate genetic sampling in breed comparisons. 相似文献
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In a sheep production system, effects of body composition on nutrient requirements for maintenance, tissue deposition and lean meat production may be important. Composition of body fractions differing in expected metabolic activity was measured for 12 nonpregnant, nonlactating, 3- to 4-yr-old ewes from each of seven breeds representing diverse body size and performance characteristics. Half the ewes in each breed had ad libitum access to feed and half were fed at maintenance levels for an average of 41 d. Ewes were slaughtered after a 72-h fast. Empty bodies were divided into visceral organs and blood (ORB); gastrointestinal tract and internal fat (GIF); head, hooves and pelt (HHP); and carcass (CAR). Water, fat, ash and the remaining fat-free dry organic matter (FFDOM) contents were determined for each fraction. Mean empty body weight (EBW) was 60.8 kg and mean composition was 47.6% water, 34.1% fat, 14.8% FFDOM and 3.5% ash. Among breeds, larger mature size generally was associated with a higher percentage of fat and a lower percentage of water (P less than .01), in agreement with carcass composition. Ewes with ad libitum access to feed had more fat and less water in their EBW than did those fed at maintenance levels, especially in the GIF fraction. Distribution of EBW averaged 58.1%, CAR, 19.0%, GIF, 15.4% HHP and 7.5% ORB. The larger, faster growing breeds had the highest proportion of the EBW and of each chemical component located in the carcass. The smaller, more prolific breeds had the highest percentages of EBW in the ORB and GIF fractions. Effects of these large genetic differences in body composition and tissue distribution on production efficiency need to be evaluated. 相似文献
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《Livestock Production Science》1987,16(2):145-162
The relative growth of carcass tissues and the partitioning of fat between depots was examined in a total of 1400 crossbred lambs from the Meat and Livestock Commission's (MLC) Ram Breed Evaluation. The evaluation was carried out over a five-year period in 10 commercial flocks of Scottish Blackface, Scotch Haltbred (Border Leicester × North Country Cheviot) and Mule (Bluefaced Leicester × Swaledale) ewes. An average of 43 sires from each of the following sire breeds was involved: Border Leicester, Dorset Down, Hampshire Down, Ile de France, North Country Cheviot, Oxford Down, Southdown, Suffolk, Texel and Wensleydale. Lambs of each cross were slaughtered over a range of 9 kg selected on the basis of estimated adult body size to cover the fatness range within which most lambs are slaughtered in Great Britain.Flocks were analysed as two groups: early flocks, from which most lambs were slaughtered before October, and late flocks. Results for early flocks are given in this Abstract. Results for late flocks were similar but they tended to fatten less quickly.Allometric growth coefficients for tissues on side (half carcass) weight were: lean, 0.77±0.015 (S.E.); total separable fat, 1.82±0.039; bone, 0.51±0.025. Perinephric and retroperitoneal fat, and subcutaneous fat, grew relatively faster than total separable fat: 1.16±0.028 and 1.16±0.011, respectively. Intermuscular fat grew relatively more slowly: 0.80±0.012. Sire breed differences were recorded (P<0.001) for the weight of each of the tissues at equal side weight. Texel crosses had the highest lean weight and Southdown crosses the lowest.At the same total lean weight, Texel crosses tended to have less lean in the loin and more in some of the other joints, especially the shoulder, than other crosses. 相似文献
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Heterosis, maternal and direct effects in double-muscled and normal cattle: II. Carcass traits of young bulls 总被引：1，自引：0，他引：1
Data on 135 young bulls from a two-breed group diallel experiment involving double-muscled (DM) and normal (N) cattle were analyzed to obtain estimates of heterosis, maternal and direct effects for carcass traits. When carcass traits were adjusted to a constant age at slaughter (398.5 d), significant positive heterosis was observed for slaughter and carcass weights, carcass length and s.c. fat thickness. Maternal effect was relatively unimportant for the traits studied. The progeny of N sires and DM straightbreds were heavier at slaughter and had higher carcass weight, s.c. fat thickness and carcass length (P less than .01), whereas DM-sired progeny and DM straightbreds had higher dressing percentage (P less than .05) and cutability (P less than .01). Heterosis was significant for all the 10-11-12th rib joint dissection traits except for percentage of muscle. Although there was negative heterosis for percentage of bone, there was positive heterosis for rib joint weight, fat weight and percentage, muscle weight and muscle:fat and muscle:bone ratios. For direct effect and straightbred differences, N-sired progeny and N straightbreds, respectively, had significantly larger values for rib joint weight, fat weight and percentage and bone weight. The DM-sired progeny and DM straightbreds had larger values for percentage of muscle, muscle:fat and muscle:bone ratios. When the carcass and dissection traits were adjusted to a constant carcass (303.7 kg) and rib joint (4,812 g) weight, respectively, the results were similar to those observed on age constant basis except for rib eye area, for which DM-sired progeny and DM straightbreds had larger values. 相似文献
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The objectives of this study were to estimate effects of sire breed (Dorset, Finnsheep, Romanov, Texel, and Montadale), and dam breed (Composite III and Northwestern whiteface) on survival, growth, carcass, and composition traits of F1 lambs. Effects of mating season (August, October, and December) were estimated for survival and growth traits. Data were collected on 4,320 F1 lambs sired by 102 purebred rams over 3 yr. Birth weight was recorded on all lambs, and subsequent BW were adjusted to 56 (weaning), 70, and 140 d of age (n = 3,713, 3,654, and 3,579 observations, respectively). Survival of dam-reared progeny (n = 4,065) to weaning was recorded. Each year, wethers from October matings were slaughtered in three groups at 25, 29, and 33 wk of age to obtain carcass data (n = 546). In addition to standard carcass traits, resistive impedance measurements were recorded on the warm carcass to predict lean mass. Dam breed (P = 0.37) did not influence lamb survival to weaning, but sire breed (P < 0.05) was important. Romanov-sired lambs excelled in survival rate to weaning (94.1%), followed by Finn-sheep (93.0%), Texel (90.7%), Dorset (90.0%), and Montadale (89.1%) sired progeny. Lower (P < 0.01) postweaning growth rate was observed for Texel (267 g/d) and Finnsheep (272 g/d) sired progeny than for Dorset (285 g/d), Montadale (282 g/d), and Romanov (278 g/d) sired progeny. Sire breed and dam breed were generally significant for most carcass traits. Breed differences in distribution of carcass fat and carcass shape were detected; however, carcass composition was similar for all sire breeds when compared at a constant carcass weight. When evaluated at a constant 12th-rib fat depth, carcasses of lambs from Finnsheep, Romanov, and Texel sires produced 1 to 1.5 kg less (P < 0.001) predicted lean mass per lamb than carcasses of lambs from Dorset and Montadale sires. These experimental results provide information about the direct breed effects for survival, growth, and carcass traits of these breeds and their potential use in crossbreeding systems. 相似文献
7.
D. J. STEWART D. L. EMERY B. L. CLARK J. E. PETERSON H. IYER† R. G. JARRETT† 《Australian veterinary journal》1985,62(4):116-120
In a field experiment on irrigated pasture, sheep of several breeds were vaccinated twice, subcutaneously, in the upper neck, with Bacteroides nodosus vaccine containing either depiliated cells (DC vaccine), or whole, piliated cells (WC vaccine) and the responses were measured over the following 14 weeks. DC vaccine was as effective as WC vaccine in protecting against the development of foot-rot under conditions of moderate challenge, although the WC vaccine induced significantly higher pilus agglutinating antibody titres. Foot-rot developed in significantly more vaccinated Merinos (Peppin and Saxon strains) than in Romney Marsh, Dorset Horn or Border Leicester breeds. Agglutinating antibody titres after WC vaccination were significantly lower in the Peppin Merino than in the other sheep for the first 6 weeks, while after DC vaccination the titres remained elevated longer in the Border Leicester and Saxon Merino and were significantly higher from 6 weeks onwards. Reactions at the inoculation sites were generally larger in the British breeds than in the Merinos and among the former the reactions were largest, most numerous and most frequently discharged their contents in the Dorset Horn. Bodyweight gains in all vaccinated sheep were initially reduced, compared with controls, but the differences were no longer significant after the eighth week. 相似文献
8.
Postweaning growth and carcass characters of 110 steers from a complete two-breed diallel of the Devon and Hereford breeds were examined under two environments. Additive and nonadditive effects were estimated using linear contrasts for several growth and carcass traits. Steers from each of the four breed groups were grown postweaning to slaughter in high- and low-nutrition environments. Weights were recorded every 2 mo. At slaughter, hot carcass weight, longissimus muscle area, kidney and channel fat, and subcutaneous fat at nine sites were measured. Heterosis for postweaning growth rate was 3.9% (P less than .01) and for slaughter weight 5.0% (P less than .01). Within the low-nutrition environment during periods of slow and fast growth, the Devons and Herefords performed differently. The growth rate of the steers differed in the two environments; however, heterosis for slaughter weight was of the same magnitude in both environments. No differences existed between the straightbreds or between the reciprocal crosses for slaughter weight. Crossbred carcasses were 7.4% heavier (P less than .01) than the straightbred carcasses; however, this effect was removed after adjustment for differences in slaughter weight. Heterosis for longissimus muscle area and carcass fatness were not significant after adjusting for carcass weight. Additive differences occurred for carcass traits. Devon carcasses had more kidney and channel fat (P less than .05) at a constant hot carcass weight and differences occurred in the partitioning of fat within the subcutaneous depot. No significant maternal effects were observed for the carcass traits measured. Crossbreeding increased carcass weight without altering composition, and relative performance was not affected by the diverse environments. 相似文献
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Mousel MR Notter DR Leeds TD Zerby HN Moeller SJ Lewis GS 《Journal of animal science》2012,90(9):2953-2962
To evaluate terminal-sire breeds, harvest BW, prefabrication carcass measurements, and organ weights were evaluated over 3 yr for 518 crossbred wether lambs (ovis aries). Lambs were produced by single-sire matings of 22 Columbia, 22 USMARC-Composite (Composite), 21 Suffolk, and 17 Texel rams to adult Rambouillet ewes. Lambs were raised to weaning under an extensive western rangeland production system and finished in a feedlot on a high-energy finishing diet. Wethers were randomly assigned to be harvested at an average BW of 54.4, 61.2, or 68.0 kg and then transported to The Ohio State University abattoir for harvest. Wether BW was recorded before transport (off-test BW) and before harvest. Prefabrication carcass measurements and organ weights were recorded either after harvest or after an approximate 24-h chill. At comparable numbers of days on feed, Suffolk-sired lambs had heavier (P < 0.01) off-test BW, harvest BW, HCW, chilled carcass weight (CCW), and kidney weights than lambs sired by the other breeds. Suffolk-sired lambs had more (P < 0.01) kidney-pelvic fat than did Columbia-sired lambs; Composite- and Texel-sired lambs were intermediate and did not differ (P > 0.06) from the other crossbred lambs. Texel- and suffolk-sired lambs had larger lm area and greater conformation scores than Columbia-sired lambs (P < 0.03). Texel-sired lambs had greater (P < 0.01) body wall thickness, quality grades, and leg scores than Columbia-sired lambs. Composite- and Suffolk-sired lambs did not differ from each other or from lambs sired by any other breed for body wall thickness (P > 0.18) and were intermediate for quality grades and leg scores. Sire breed did not affect (P > 0.05) shipping shrink, dressing percentage, pelt weight, liver weight, and fat depth. Adjusting data to a comparable off-test BW or CCW modified sire breed rankings for some measurements. Texel-sired lambs were equal or superior to lambs sired by other breeds for HCW, CCW, dressing percentage, pelt weight, LM area, quality grade, and leg and conformation scores. However, Texel-sired lambs also had values for kidney-pelvic fat weight, fat depth, and body wall thickness that were equal to or greater than those of lambs sired by the other breeds, indicating increased fatness at comparable BW. Producers can use these results to select terminal-sire sheep breeds that will complement their production system and improve market lamb value. 相似文献
11.
Five breeds of sheep, Romney Marsh, Dorset Horn, Border Leicester, Peppin Merinos and Saxon Merinos were examined for their susceptibility to foot-rot by exposure to natural transmission of infection on irrigated pasture or by the application of pure cultures of Bacteroides nodosus to each foot in a pen experiment. On pasture, the sheep encountered a moderate challenge and the British breeds were more resistant than Merinos to the development of severe foot-rot. Resistance was manifested by a rapid resolution of relatively benign lesions in the interdigital skin, rather than a reduction in the number of feet affected. However, under more severe challenges with foot-rot in pens, all breeds were equally susceptible. There was little difference between resistant and susceptible sheep in the kinetics and magnitude of their antibacterial immune responses indicating that resistance did not depend on pre-existing antibody or a more rapid induction of antibody production. In each experiment, humoral immune responses against B. nodosus were not greatly elevated until under-running lesions of the hoof developed. 相似文献
12.
An experiment with 127 barrows representing five genotypes, 1) H x HD, 2) SYN, 3) HD x L[YD], 4) L x YD, and 5) Y x L (H = Hampshire, D = Duroc, SYN = synthetic terminal sire line, L = Landrace, and Y = Yorkshire), was conducted to evaluate growth and development of swine from 59 to 127 kg live weight. Animals were allowed ad libitum access to a pelleted finishing diet containing 18.5% CP, .95% lysine, and 10.5% fat, with an energy density of 3,594 kcal of ME/kg. Pigs were serially slaughtered at either 59, 100, 114, or 127 kg live BW. After slaughter, carcasses were chilled and backfat was measured at four locations. The right side of each carcass was fabricated into primal cuts of ham, loin, Boston Butt, picnic, and belly. Composition of each primal cut was determined by physical dissection into lean, fat, bone, and skin. Estimated allometric growth coefficients for carcass length, carcass weight, and longissimus muscle area relative to BW; carcass lean, fat, bone, and skin relative to both BW and carcass weight; and lean in each of the primal cuts relative to total carcass lean did not differ (P greater than .05) among genotypes. Relative to BW, the pooled growth coefficient(s) for carcass weight was (were) greater (P less than .001) than unity, whereas those for carcass length, longissimus muscle area, and backfat at first rib were smaller (P less than .001) than unity. Those for other backfat measurements were close to 1.00. Relative to either BW or carcass weight, the pooled coefficient(s) for fat was (were) greater (P less than .001) than unity, whereas those for lean, bone, and skin were smaller (P less than .001) than unity. Growth of lean, backfat, bone, and skin in the carcass were nearly linearly associated with increases in BW. The increase in fat weight was curvilinear as the pig grew and was accelerated in later growth stages, indicating that carcass fat percentage increased with increased BW. 相似文献
13.
B K Knudson M G Hogberg R A Merkel R E Allen W T Magee 《Journal of animal science》1985,61(4):797-801
Differences in total carcass bone, muscle and fat, and linear measurements of the tibia and radius were evaluated in barrows at 105 kg and boars at 105, 118, 132 and 145 kg live body weight. The carcasses of five replicates were physically separated into skin, bone and soft tissues, and the linear measurements of the tibia and radius were obtained on seven replicates. At live weight of 105 kg, boars did not differ significantly in fat-free muscle, but they had 33.2% less fat, 11% greater bone weight and 14% greater skin weight than barrows. At 145 kg, boars had total carcass fat weight comparable with 105-kg barrows. Fat-free muscle, bone and skin weight of boars increased at linear rates of .41, .083 and .104 kg/kg of body weight increase from 105 to 145 kg, respectively. At 105 kg, density and length of the tibia and radius did not differ between boars and barrows. The tibia of boars were heavier than those of barrows at 105 kg, resulting in a greater ratio of tibia weight to length (indirect measure of bone thickness). As boars increased in live weight from 105 to 145 kg, total weight and length of the tibia and radius increased linearly. The ratio of weight to length of the tibia and radius increased during this 40-kg weight gain, indicating that weight of both bones increased at a greater rate than length. These results indicate that boars and barrows have the same weight of total carcass fat when boars are 40 kg heavier than the barrows. The greater bone weight of boar carcasses compared with barrows is due to greater bone thickness. 相似文献
14.
随着人民生活水平提高和膳食结构调整,绵羊奶必将受到人们的青睐.选取甘肃肉用绵羊新品种群、无角陶赛特和特克塞尔3个品种各8只母羊,对产后1～56 d泌乳理化性质变化进行研究,结果表明：3个品种乳成分及物理性质在第1～3 d变化最为明显,其中乳蛋白含量、非脂固形物含量和酸度3项指标呈现出前期快速下降,中期下降减缓,后期缓慢上升;乳糖指标则呈现出缓慢的前期上升,后期下降的趋势,对选取的3个品种初乳中蛋白、乳脂和可溶性固形物含量等指标对比,依次下降,乳糖含量和密度特克塞尔最高.常乳中除密度外3个品种间差异不显著（P＞0.05）.这为绵羊早期断奶和补饲提供了基础数据. 相似文献
15.
A deterministic computer model was used to predict effects of genetic improvements in performance and of management options on life-cycle flock TDN input per unit of empty body weight (EBW) or carcass lean (CLN) equivalent value of market lamb, cull ewe, and wool output from a pure breeding system of sheep production for sheep fed to maintain normal weight. Relative values per kilogram for market lambs, cull ewes, and clean wool were 1 to .33 to 2.04 in lamb empty body equivalent, but 1 to .33 to 1 in lamb carcass lean equivalent. A 10% increase in lamb viability improved TDN/EBW or CLN by -15 to -20% for high to low lambing rates. Corresponding smaller gains were -7 to -11% for fertility, -3 to -13% for lambing rate, -1 to -3% for wool growth rate, -1 to -5% for milk production without creep feeding, -2 to -1% for mature size to about 70 kg, and -.6 to -.9% for precocity of fertility. Increasing leanness 10% improved TDN/CLN by -3 to -1% but increased TDN/EBW 3% because of higher maintenance requirements of leaner sheep. Higher protein requirements for increased lambing rate, milk production or leanness, or greater increases in non-feed than in feed costs, would mean only slightly less reduction of TDN/output than shown. Creep feeding was beneficial only for prolific, low-milking stock. Flushing reduced adverse effects of restricted feeding. Different values for wool vs meat or for costs of feed vs non-feed inputs would change results. These estimates for relative economic importance of traits apply to derivation of optimum criteria for selection among breeds or crosses, or within-breeds used in rotation crossbreeding, but would differ for specialized terminal-sire or maternal breed roles. 相似文献
16.
Four breeds of sheep, Hampshire, Southdown, Cheviot and Scottish Blackface, which differ in mature body size and body composition were intensively reared under an ad libitum or a restricted feeding regime. Thyroid activity was assessed at 13 weeks of age by the131I uptake method. Slaughter at 24 weeks (ad lib) or 32 weeks (restricted) was followed by carcass dissection. The anticipated differences in body type represented by the 4 breeds was confirmed in terms of size and fatness. The Hampshires had the highest growth rate (liveweight for age) and the lowest thyroid uptake, and the breed differences in thyroid activity were shown to be independent of liveweight. Thyroid activity was positively related to growth rate in the Hampshires and negatively related to growth rate in the 3 other breeds. No association could be found however between the thyroid activity and the proportionate growth of body fat or lean. None of these conclusions were affected by a mild restriction in feed intake. 相似文献
17.
Effects of Duroc, Meishan, Fengjing, and Minzhu boars on carcass traits of first-cross barrows. 总被引：6，自引：0，他引：6
L D Young 《Journal of animal science》1992,70(7):2030-2037
Duroc, Meishan, Fengjing, and Minzhu boars were mated to crossbred gilts during two breeding seasons. From each sire breed group each season, six pens of approximately eight barrows each were slaughtered. A pen of pigs from each sire breed group was slaughtered at 7-d intervals from 168 to 203 d of age each season. Breed of sire effects were significant for all age-adjusted carcass traits except carcass length, fat thickness at the last rib, color score, and firmness score. At 184 d of age, Duroc crosses had the heaviest (P less than .05) slaughter and carcass weights; Minzhu crosses were lighter (P less than .05) than Meishan crosses but not lighter than Fengjing crosses. Differences among age-constant traits reflect differences in BW. After adjustment to a constant carcass weight of 78 kg, the three Chinese breeds had very similar carcass characteristics. Carcasses sired by Durocs had significantly less backfat and larger longissimus muscle area than carcasses sired by the Chinese breeds. Weight of each trimmed wholesale lean cut and their total weight were significantly higher for Duroc crosses than for Chinese crosses. Breed of sire means did not differ significantly for belly weight, but Duroc crosses had less (P less than .05) weight of leaf fat. Relative to Chinese crosses, longissimus muscles from Duroc crosses had more marbling (P less than .05). Sire breed groups did not differ significantly for color or firmness score. Pigs sired by Meishan, Fengjing, and Minzhu produced carcasses with significantly less lean content at a carcass weight of 78 kg than did pigs sired by Duroc. 相似文献
18.
In vivo prediction of internal fat weight in Scottish Blackface lambs, using computer tomography 总被引：1，自引：0，他引：1
N.R. Lambe J. Conington K.A. McLean E.A. Navajas A.V. Fisher & L. Bünger for the Sustainable Livestock Systems Group SAC 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2006,123(2):105-113
From a calibration trial involving computer tomography (CT) scanning and dissection of 45 lambs, a prediction equation was derived to estimate total internal fat weight in Scottish Blackface lambs from measurements taken on cross‐sectional CT images. Using data from two cross‐sectional images (at the hip and loin) internal fat can be predicted with relatively high accuracy (adjusted R2 = 62.2%, r = 0.79). The derived equation was then used to predict internal fat weights in a further 427 Scottish Blackface lambs from a separate trial. Phenotypic correlations were calculated between predicted internal fat weight and weights of total carcass fat, muscle and bone, predicted using previously derived equations. When considering absolute tissue weights, adjusted for fixed effects, internal fat showed the strongest positive correlation with carcass fat (0.58), followed by muscle (0.36), and then by bone (0.32). When tissue weights were adjusted for fixed effects and total carcass weight (so considering tissue weights relative to size), internal fat showed a lower correlation with carcass fat weight (0.36) and negative correlations with muscle (?0.35) and bone (?0.19). These results provide the basis for more complex studies of relationships (phenotypic and genetic) between internal fat in hill lambs and economically important traits, such as carcass composition and survival of lambs, and tissue levels in different depots in hill ewes. 相似文献
19.
Carcass data from more than 4,400 Southdown x Romney ewe and wether lambs collected over a 16-yr period were analyzed for the effects of sex, rearing status, and growth rate. Ewe lambs grew more slowly than wethers and had .78 kg less carcass weight at the same age. The carcass weight advantage for wethers was nearly all caused by heavier fat-free weight. Based on fat depths, the fat on ewe lambs was distributed in more anterior and ventral parts of the carcass relative to wether lambs. Lambs reared as twins had 1.73 kg less carcass weight and correspondingly reduced carcass measurements compared with lambs reared as singles. Sex and rearing status interacted for some traits. However, in no case was a significant sex difference reversed in single- and twin-related lambs. Growth rate effects were determined by regressing average change in carcass measurements on average carcass weight gain over a 5-wk period. When carcass weight remained constant over a 5-wk period, fat weight increased by .12 kg, fat-free weight and muscle measurements decreased, and bone lengths increased. For each kilogram of increase in 5-wk carcass weight gain, the marginal increase in fat weight was .41 kg and that of fat-free weight was .59 kg. At the average 5-wk carcass weight gain of 1.4 kg, fat and fat-free gains were As carcass weight gain increased above 1.4 kg, fat-free gain exceeded fat gain. 相似文献
20.
对2．5月龄断奶公羔经60d舍饲强度育肥后，选择体重接近组内平均值的DAF1、SAF1、DAF2、SAF2与同龄ALT各4只进行屠宰试验，测定其产肉性能。结果表明：DAF1、SAF1、DAF2、SAF2杂交公羔宰前活重、宰后1h胴体重、一级肉率和去尾脂屠宰率、净肉率等指标均高于ALT羊，尾脂率由原来的15．75％下降到1．06％～2．79％，杂交羔羊胴体外观评级达到“1级”标准。说明用陶赛特羊、萨福克羊对阿勒泰羊改良后，其胴体品质得到明显改善，更加符合现代人们追求“高蛋白、低脂肪”的消费需求。 相似文献