共查询到19条相似文献，搜索用时 218 毫秒
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《中国畜牧杂志》2017,(1)
实验旨在探讨非遗传因素对西门塔尔母牛繁殖性状的影响规律。利用新疆呼图壁种牛场1987-2015年间共1 515头西门塔尔牛生产性能记录,分析不同胎次、产犊年份、产犊季节、初产月龄对西门塔尔母牛空怀期、产犊间隔和妊娠期的影响,并进行了最小二乘分析。结果表明:不同胎次对西门塔尔母牛空怀期、妊娠期影响不显著(P0.05),对母牛产犊间隔影响极显著(P0.01);不同产犊年份对母牛空怀期、产犊间隔、妊娠期影响极显著(P0.01);不同产犊季节对西门塔尔母牛空怀期、产犊间隔、妊娠期影响极显著(P0.01);不同初产月龄对西门塔尔母牛空怀期、产犊间隔、妊娠期影响显著(P0.05)。 相似文献
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对河南地区4个大型奶牛场荷斯坦牛繁殖记录进行了统计,综合采用单因素方差分析和卡方分析的方法分析了牧场、产后首次配种时间、胎次和季节对荷斯坦牛繁殖性能的影响。结果表明:(1)荷斯坦牛的平均初产月龄为26.2月,产犊间隔为438d,情期受胎率为45.2%,流产率为3.4%,死胎率为10.5%。(2)不同牧场对荷斯坦牛初产月龄、产犊间隔、情期受胎率、流产率和死胎率的影响差异很大。(3)产后51~60d首次配种奶牛情期受胎率最高(85.7%),产后161~170d首次配种奶牛情期受胎率最低(30.7%)。(4)胎次对流产率和死胎率影响不显著(P0.05),但随着胎次的增加,产犊间隔逐渐减少,以产第5胎的产犊间隔最小,但与产第6胎产犊间隔差异不显著(P0.05),与其它胎次间产犊间隔均差异极显著(P0.01)。(5)夏季荷斯坦牛情期受胎率最低(29.9%),死胎率最高(14.3%);春季情期受胎率最高(52.8%),死胎率最低(2.6%)。 相似文献
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为了探讨各种因素对新疆地区荷斯坦牛产犊间隔的影响,本文采用SAS8.1软件对影响产犊间隔的因素进行最小二乘方差分析。不同场地对产犊间隔的影响不显著(P0.05);不同胎次对产犊间隔有显著的影响(P0.05),产犊间隔随胎次增加有延长的趋势;不同产犊季节对产犊间隔有极显著的影响(P0.01),冬春季节的产犊间隔明显高于夏秋季节;不同产奶量对产犊间隔有极显著的影响(P0.01),产犊间隔随着产奶量的增加而延长。产犊季节和产奶量是影响产犊间隔的主要因素。 相似文献
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《黑龙江畜牧兽医》2015,(23)
为了探讨广西杂交水牛初配月龄、产犊间隔、犊牛出生重与第一泌乳期泌乳天数、泌乳量的关系,研究主要以广西壮族自治区水牛研究所水牛种畜场繁殖生产原始记录作为依据,分析76头杂交水牛初配月龄及各胎次产犊间隔、犊牛出生重以及第一泌乳期泌乳天数及泌乳量的规律。结果表明:杂交母水牛的平均初配月龄为32.75月龄,平均产犊间隔为18.29个月,平均出生重为37.74 kg,第2~5胎的杂交水牛犊牛出生重显著高于第6~7胎(P0.05),杂交水牛不同初配月龄对其泌乳天数无显著影响(P=0.504),但初配月龄为31~36月龄的杂交水牛的产奶量显著高于初配月龄小于24月龄或25~30月龄的杂交水牛(P=0.015)。因此,适当推迟初配月龄有助于提高产奶量。 相似文献
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皮南横交牛生产性能试验研究 总被引：1，自引：0，他引：1
冯磊 《河南畜牧兽医(综合版)》2011,32(9):8-10
调查了皮南牛和南阳牛初情时间、初配时间、发情周期、妊娠期、产后配种时间、犊牛初生重、难产率、产犊率等指标。调查分析结果表明，皮南横交牛初情时间、初配时间均较南阳牛早3个月左右。虽然两群体间总体产犊率差异不显著，但皮南牛1岁半至2岁产犊率达57％，两群体差异极显著，也证明了皮南牛的性早熟特点。产犊后配种时间皮南横交牛比南... 相似文献
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《中国奶牛》2021,(6)
产犊间隔对奶牛繁殖性能和泌乳性能有重要影响。本研究利用最小二乘法对江苏某奶牛场2010-2018年产犊的荷斯坦牛共19 748条产犊间隔数据进行了分析。结果表明,第5胎产犊间隔最大(397.17d),第4胎产犊间隔最小(385.95d),第2、4、6胎产犊间隔无显著差异(P0.05);初产月龄多集中在第25～26月龄,初产月龄在22月龄以下的产犊间隔最大(398.07d),初产月龄在31月龄以上的产犊间隔最小(384.14d),产犊间隔随初产月龄的增加而减少;2015年产犊的产犊间隔最大(398.12d),2011年产犊的产犊间隔最小(375.43d);夏季产犊的产犊间隔最大(407.87d),秋季产犊的产犊间隔最小(385.90d)。综上分析,胎次、初产月龄、产犊年度、产犊季节等均可以显著影响荷斯坦牛的产犊间隔。 相似文献
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R E Sacco J F Baker T C Cartwright C R Long J O Sanders 《Journal of animal science》1990,68(10):3103-3108
Reproductive and calving records of 611 cows from F1 and F2 generations from a diallel mating system with Angus, Brahman, Hereford, Holstein and Jersey were examined. The inter se matings were by artificial insemination, and each cow had three or four parturitions. Dependent variables included weight, hip weight at first calving, age at first calving, gestation length and calving interval. Brahmans were the heaviest, tallest and oldest purebred at first calving. Crossbred Brahman females tended to be older than other crosses at first calving. Purebred Brahmans and one-half Brahman crosses also had the longest gestation lengths and calving intervals. First-gestation (F1) crossbred cows were 18 kg heavier (P less than .05), 2.0 cm taller (P less than .01) and 35 d younger (P less than .05) at first calving than contemporary straightbreds. Average maternal heterosis for height at calving was significant (1.4 cm; P less than .05); however, estimates of specific and average maternal heterosis for measurements taken at first calving were generally nonsignificant. Estimates of specific and average individual and maternal heterosis were generally small and nonsignificant for gestation length and calving interval. 相似文献
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Data from 321 spring-calving cows (mean calving date March 27) were used to assess the effects of body condition, live weight, cow age (from 4 to 13 yr), and breed (237 Hereford x Friesians and 84 Blue-Greys) and time of calving on the proportion of cows that became pregnant, the number of days from the start of mating to pregnancy, and calving interval. Mating started at turn-out to pasture in mid-May and lasted 9 to 10 wk. Body condition at calving and breed were the most significant animal factors affecting reproductive performance. Cows calving in higher body condition had shorter (P less than .001) calving intervals (11.2 d per unit of body condition at calving). Blue-Grey cows became pregnant in a higher proportion (90%) and calving interval was shorter (364 d) than in Hereford x Friesians (83%; 374 d). Body condition at the start of mating was less important and body condition at the end of mating had no effect. Live weight at calving and changes in live weight from calving to the start of mating and during the mating period had no significant effect. The proportion of cows becoming pregnant decreased significantly with age in Hereford x Friesian cows older than 7 yr. The variance in calving interval accounted for by calving date, body condition at calving, breed, and age was 42%. 相似文献
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A study was conducted to evaluate the effects of postpartum prostaglandin treatment on reproduction in 3 seasonal calving dairy herds. Recently calved lactating dairy cows were paired on herd, age, calving date and previous production index. One cow in each of the 196 pairs received a single intramuscular injection of 25 mg of the prostaglandin analogue, dinoprost, between 14 and 28 days after calving. Subsequent reproduction was monitored. Within each herd and overall, there was no significant effect of treatment on the intervals from calving to first service, mating start date to first service, calving to conception, mating start date to conception and first service to conception. Treatment also had no significant effect on 21-day submission and pregnancy rates, on the proportion of each group not pregnant at the end of mating, and on first service pregnancy rates. Responses to treatment did not vary between cows calving within 50 days of mating start date and earlier calving cows or between cows aged less than 5 years and older cows. 相似文献
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Conception rates in farm mink (Neovison vison) in relation to first mating date,age and color variety 
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下载免费PDF全文 The aim of the study was to analyze the effects of the first mating date, age and color variety on the conception rates in farm mink. We analyzed female mink reproductive performance in 492 Sapphire and 463 Standard Black females over 3 or 4 years. The analysis included the number of inefficient matings, the interval between the first inefficient mating and the efficient mating (copulation) and the conception rates. The results show a significant effect of female's age and color variety on the conception rates. The youngest, yearling females of either color needed a higher number of matings per conception, as compared to older, 2‐ and 3‐year‐old females. Black females demonstrated a higher number of inefficient matings (1.066), as compared with Sapphires (0.730). Yearling females were most often mated from 1 to 10 March, and older females from 11 to 20 March. Older females achieved better conception rates than the yearlings. Dates between 11 and 25 March proved to be the optimum for the first mating, since the highest conception rates were observed if the females had mated during this period. 相似文献
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Apori Samuel Obeng Hagan Julius Kofi Osei Yaa Doris 《Tropical animal health and production》2015,47(1):221-225
A study on the growth and reproductive performance of two rabbit breeds was undertaken. Data on 588 kits and 97 does of California White and 574 kits and 90 does of New Zealand White rabbits reared under hot and humid environment in Ghana were taken. The reproductive performance of the two breeds, in terms of litter size at birth and weaning, litter weight at birth and weaning, kindling interval, age at sexual maturity, and gestation length as influenced by breed, season of kindling (rainy and dry), year of kindling (2005–2012), and parity (first to sixth and over) were determined. The performance of California White in terms of litter size at birth, at weaning, kit weight at birth, and age at first kindling was 5.9?±?0.2, 4.6?±?0.1, 54.7?±?0.4 g, and 159.8?±?0.2 days, respectively. That of New Zealand White was 5.9?±?0.1, 5.1?±?0.1, 55.2?±?1.0 g, and 159.9?±?0.2 days, respectively. The results obtained also showed a significant breed effects on kit weight at birth, litter weight at weaning, and mortality; whereas no significant differences (p?>?0.05) were observed between the two breeds regarding the other traits measured. Parity had significant effects (p?<?0.05) on all the growth and reproductive parameters measured with the exception of age at first kindling. Year of kindling also had significant effect on litter weight at birth, kit weight at birth, and at weaning (p?<?0.05) but did not have any significant effect on the age at sexual maturity and mortality. Season also had significant (p?<?0.05) effects on kit weight at birth, gestation length, kindling interval, and mortality with better performance experienced during the rainy season.
相似文献16.
本研究对7 945窝大白母猪妊娠周期、总产仔数、产活仔数、健仔数、弱仔数、畸形数、死仔数、木乃伊及死胎数9个繁殖性状进行了最小二乘分析,分析了胎次、配种季节及妊娠周期分类对母猪繁殖性能的影响;并利用动物模型REML(约束最大似然)方法估计动物繁殖性状的遗传力及性状之间的遗传相关.结果表明,胎次对畸形数(P=0.2619)和木乃伊(P=0.4639)影响不显著(P >0.05),对其他7个繁殖性状影响极显著(P <0.01);配种季节对妊娠周期、产活仔数、弱仔数、木乃伊、死仔数及健仔数影响极显著(P <0.01),对畸形数(P=0.3993)影响不显著(P> 0.05),对总产仔数和死胎数影响显著(P <0.05).妊娠周期对木乃伊影响显著(P <0.05),对其他7个性状影响极显著(P <0.01).妊娠周期遗传力最高,为0.34,其他繁殖性状遗传力都低于0.2,为低遗传力性状.总产仔数与妊娠周期之间存在负遗传相关(rg=-0.10),与产活仔数及健仔数之间存在较强的正遗传相关,遗传相关都超过0.80.妊娠周期与其他繁殖性状之间的遗传相关较小,最高的为妊娠周期与畸形数之间的遗传相关为-0.17.由此得出结论,妊娠周期属于中等遗传力性状,妊娠周期不仅受到胎次、季节等环境因素的影响,而且也受总产仔数等繁殖性状的影响,妊娠周期可作为养猪生产的间接指标. 相似文献
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Genetic Parameter Estimation and Affecting Factor Analysis of Reproduction Traits in Large White Sow
SHI Hui-bi WANG Li-gang LIANG Jing YANG Hou-de LIAO Ling-ling CHEN Zhao LIU Xin ZHAO Ke-bin ZHANG Long-chao YAN Hua WANG Li-xian 《中国畜牧兽医》2015,42(6):1530-1537
In this study,7 945 litter records from 2 904 Large White sows were used to determine the effect of parity,mating season and the classified gestation length on total number born (TNB),number born alive (NBA),number healthy birth (NHB),number weak birth (NWB),deform fetus,number born dead (NBD),mummy fetus and stillbirth. Genetic parameters and genetic correlation of the above reproduction traits were estimated by restricted maximum likelihood (REML) procedure.The results indicated that the parity had non-significant effect on deform fetus (P=0.2619) and mummy fetus (P=0.4639),but had significant effect on other 7 reproduction traits (P <0.01).The effect of mating season on gestation length,NBA,NWB,mummy fetus,NBD and NHB were highly significant (P <0.01),while mating season effect on deform fetus was not significant (P=0.3993).Moreover,the effect of mating season on TNB and stillbirth were significant (P <0.05).Effect of different gestation length classification was significant on mummy fetus (P <0.05),and was highly significant on the other 7 traits (P <0.01).The gestation length got the highest heritability,at 0.34,while others below 0.2 as low heritability traits.There was a negative genetic correlation (rg=-0.10) between gestation length and TNB,while a strong positive genetic correlation exists among TNB,NBA and NHB (rg >0.80).The genetic correlation between gestation length and other reproductive traits was low,the highest one appears between gestation length and deform fetus reached -0.17.We concluded that the gestation length was medium heritability trait,it was influenced not only by environment factors (such as parity,mating season) but also reproductive traits like TNB,and gestation length could be used as an indirect indicator in pig production. 相似文献
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A D Leman 《Veterinary Clinics of North America: Food Animal Practice》1992,8(3):609-621
The most universally accepted measure of reproductive performance is PSY. Excellence is achieved by reducing NPD, increasing liveborn litter size, and reducing preweaning mortality. To reduce NPD, farm management should be directed to improve farrowing rate. Matings that occur in late summer usually are less fertile as the result of the pig's normal seasonal variation. Confinement gestation stalls are the best prevention for the reduced farrowing rate caused by season. Liveborn litter size is the result of a mixture of genetic and management variables. F1 females have the highest heterosis. The management variables of age at first mating, wean-to-service interval, skip mating, lactation length, and parity all influence litter size. 相似文献
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P Concannon S Whaley D Lein R Wissler 《American journal of veterinary research》1983,44(10):1819-1821
Variation in canine gestation length was studied in a Beagle colony (n = 290) in which apparent gestation length, estimated as the interval from the day of first mating to the day of parturition, ranged from 57 to 72 days, and averaged 65.3 +/- 0.2 days. The interval from the day of the peak in luteinizing hormone (LH) to parturition was less variable and ranged from 64 to 66 days and averaged 65.1 +/- 0.1 days (n = 54). Apparent gestation lengths less than or equal to 61 days all resulted from mating greater than or equal to 3 days after the LH peak; those greater than or equal to 68 days all followed initial or single matings occurring greater than or equal to 2 days before the LH peak. Fertile single matings 3 days before the LH peak provided evidence that the potential postcoital fertile longevity of canine sperm is at least 6 days and thus contributed, along with variability in the onset of estrus, to the observed variation in apparent gestation length in the dog. The limited range in the interval from the day of the preovulatory LH peak to the day of parturition (64, 65, or 66 days) demonstrates a considerable regularity in the sequential events of gestation in the dog. 相似文献