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孕前补饲对山羊繁殖性能的影响 总被引：2，自引：0，他引：2
选择健康、空怀、经产、膘情中等以上的母羊分为两组(试验组70只,对照组52只),比较孕前补饲对山羊受胎率、产羔率、初生重、羔羊成活率等繁殖性状的具体影响程度.结果发现试验组与对照组母羊产单羔和双羔的百分率差异不显著,产多羔的母羊比对照组高4.3%;母羊受胎率差异不显著;羔羊死亡率比对照组下降16.9%;产单羔的初生重差异不显著,双羔的初生重比对照组高0.14 kg,差异极显著(P＜0.01).在配种前搞好放牧抓膘和补饲,实行满膘配种,是提高母羊繁殖性能的重要措施. 相似文献
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亚硒酸钠VE对双羔初生重及生长发育的影响 总被引：3，自引：0，他引：3
在中国新疆美利奴羊３岁妊娠母羊中，随机分出５０只，在预产前３０ｄ时肌注亚硒酸钠ＶＥ５ｍｌ／只，在处理组母羊生产的羔羊中，随机分出双羔３６只，单羔３２只，并在出生后８ｈ内肌注亚硒酸钠ＶＥ２ｍｌ／只。为了验证亚硒酸钠ＶＥ的效果，在对照组６９只母羊分娩的羔羊中，也分出单双羔３２和３６只作为对照组。试验结果表明，双羔的初生重、３０日龄体重和增重分别比对照组提高了７６９％、２３１３％（Ｐ＜００１）和３４４６％（Ｐ＜００１），而３０日龄羔羊的下痢和死亡率均降低了８３３个百分点 相似文献
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磺胺二甲嘧啶与乙嘧啶联用治疗经验性感染弓形体的妊娠母羊，１５只未经治疗的母羊产下１４只活羔和６只死羔，而经治疗的１２只母羊产的１５只羔羊全存活，且胎盘病变轻微和妊娠期较长，羔羊吃初乳前，体内鼠弓形体抗体价明显较低。 相似文献
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《中国畜牧杂志》2020,(7)
试验旨在研究山羊不同母性行为对羔羊体重的影响,选用健康、产期相近的雷州山羊6只,其中3只初产、3只经产,经产母羊此次产羔均为第3胎。羔羊出生后,连续1周采用24 h监控系统全事件记录母羊的母性行为时长。产羔后利用布条对羔羊进行编号和区分,在出生和生产第10天对羔羊进行称重。结果表明:初产母羊对羔羊的舔舐和嗅闻与经产母羊相比显著升高,而寻找羔羊、待在一起和哺乳时长显著降低;经产羔羊平均日增重较初产羔羊显著升高,且单羔的平均日增重是双羔的1.8倍;母羊不同哺乳时长、平均中断或拒绝哺乳次数均与羔羊日增重及10日龄重存在显著相关性。综上,母羊胎次及产仔数通过影响母羊与羔羊亲子联系的建立及母性行为的表达间接影响羔羊日增重。 相似文献
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注射双羔素提高哈萨克羊繁殖效果的试验 总被引：1，自引：0，他引：1
选择经产母羊50只为试验组,并以同一养殖小区内的未经处理的经产哈萨克母羊452只作为对照组,观察测定其产羔率和双羔率。结果表明,2004年试验组50只,产羔61只,产羔率122%。其中产双羔的母羊11只,双羔率22%。对照组452只,产羔464只,产羔率102.66%。其中产双羔的母羊12只,双羔率2.66%。试验组产羔率比对照组提高了19.34%(P<0.01),表明双羔素可以提高哈萨克羊产羔率。 相似文献
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用注射双羔素的方法研究提高巴什拜羊母羊产羔率。选择经产母羊50只为试验组,并以同一养殖小区内的未经处理的经产巴什拜母羊452只作为对照组,观察测定其产羔率和双羔率。结果2008年试验组50只,产羔61只,产羔率122%。其中产双羔的母羊11只,双羔率22%。对照组452只,产羔464只,产羔率102.66%。其中产双羔的母羊12只,双羔率2.66%。试验组产羔率比对照组提高了19.34%(P<0.01)。结果表明,双羔素可以提高巴什拜羊产双羔率。 相似文献
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产羔期、补饲水平对考力代羊生产和繁殖性能影响的研究 总被引：2，自引：1，他引：1
为了研究草地一绵羊系统中草畜供求间的动态平衡，寻求在人工草地放牧条件下适宜的产羔时期及在此时期给产羔母羊的合理补饲水平，１９９０～１９９３年，在贵州省威宁县灼甫联户示范牧场进行了两期产羔期及补饲水平对绵羊生产性能影响的试验。产羔期的改变，导致了母羊及羔羊体重的不同变化趋势。结果显示出母羊体重对其生产、繁殖性能的重要性。春羔母羊配种前体重较之冬羔母羊提高９．７５ｋｇ，两者产羔率分别为１３９．２％和１１６．１％。春羔母羊较高的双羔率导致了春羔母羊较之冬羔母羊更低的繁殖成活率（分别为９１．２％和１０４．７％）。断奶时，春羔较之冬羔体重高５．２５ｋｇ，但断奶以后这种优势即消失了。补饲水平的差异对母羊及羔羊体重有一定的影响，但在牧草丰富的条件下表现得并不很强烈。 相似文献
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The transmission of mucosal disease virus (MDV) from infected ewes and their lambs to susceptible sheep was investigated. MDV was recovered from the amniotic fluid of an infected pregnant ewe and from the blood, nasal swabs and urine of hairy lambs. MDV infection was transmitted either at lambing, from infective foetal fluids or lambs, or later as a result of contact with a surviving with a hairy lamb and either aborted or gave birth to an infected hairy lamb. Adult sheep and 12-months-old sheep were less readily infected than were newborn lambs. Pregnant ewes were infected by contact with a hairy lamb and either aborted or gave birth to an infected hairy lamb. A method to minimise spread of the infection in the field is suggested. 相似文献
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G. Nitter 《Livestock Production Science》1975,2(2):167-177
A crossbreeding experiment with sheep was carried out at two of the University's experimental stations between 1969 and 1973. On farm I ewes of five groups of different first crosses were tested against the indigenous purebred Merinoland sheep for five lambing periods. The ewes were kept under an accelerated lambing programme, the lambs were reared artificially. On farm II the same domestic breed was tested against three first cross lines with spring lambing and ewes suckling their lambs for 5 to 8 weeks. Each test group consisted of at least 50 ewes made up of 10 halfsib groups. 10 rams of each of four exotic fat lamb sire lines were hand-mated to the ewes. In addition, purebred and special control matings were carried out. All ewes in the experiment were of the same age.The data were analyzed by least squares procedures for different reproductive traits (gestation length, litter size for lambs born and reared, litter weight, score for lambing difficulties) and by simple one-way classifications for various others (lambs born and reared per ewe and year, lambing frequency, body weight, fleece weight, wool income).Since no significant interactions among main effects were detected for any trait, the presentation of the results emphasizes the general combining ability of the sire and dam lines. No significant differences were found between sire lines on both farms in all traits except gestation length. For the most important reproductive traits the differences between the dam lines were highly significant, the Finnish Landrace crosses being the best in both lambing frequency and number of lambs per litter. The superiority of these crosses cannot be maintained for the number of lambs reared and slaughtered, if, like in farm II, facilities are not available to rear lambs of large litters without high losses. 相似文献
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藏系绵羊在产羔后分为4组,进行为期90天的补饲试验,结果:试验1组只均日补饲优质青干草0.5 kg,母羊和羔羊的增重分别为1.57kg和5.29kg;试验2组只均日补饲精料0.25kg,母羊和羔羊的增重分别为2.36 kg和7.9kg;试验3组只均日补饲精料0.5kg,母羊和羔羊的增重分别为4.25 kg和10.02kg;试验4组只均日补饲营养添砖0.15kg,母羊和羔羊的增重分别为1.7kg和6.51kg。4个试验组均达到了母羊保膘和羔羊成活的目的。其中,第3组母羊和羔羊的增重最高,饲料成本也最高;第1组母羊和羔羊的增重最少,但补饲成本最低。 相似文献
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Autopsies were performed on lamb carcases from 2 groups of Merino ewes lambing in paddocks in spring 1978 and from 1 group lambing in pens in 1980 in southwest Queensland. These showed that the main causes of death were starvation due to failure of the lamb to obtain milk, problems at parturition causing death during or shortly after birth and, in some cases, predation. The majority of lambs died within 1 week of birth with the highest mortalities occurring in the lighter lambs. In the pen study, mean birth weight of lambs that died was 3.0 (s.d. = +/- 0.5) kg. The mean daily weight loss of lambs that died of starvation in the pens was 0.22 kg and the mean loss to autopsy was 0.35 kg. In the pen study, there were more lamb deaths, deaths from starvation, mismothering and desertion in each of 2 groups fed a below maintenance ration than in an above maintenance group. More lambs died and more lamb deaths were due to starvation in a group with unsound udders than in a sound udder group. The results are similar to those found by workers investigating perinatal lamb mortality in other areas. Their significance is discussed in relation to Merino sheep flocks in southwestern Queensland. 相似文献
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人工草地绵羊放牧系统研究—产羔期试验 总被引：1，自引：0，他引：1
试验监测了在划区轮牧条件下的放牧系统中两种产盖期中的牧草生长速度、绵羊采食量以及绵羊生产性能等有关指标的动态变化，探讨了两种产羔期对放牧系统中草地和绵羊产生的影响。 相似文献
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J. W. Plant R. Marchant T. D. Mitchell J. R. Giles 《Australian veterinary journal》1978,54(9):426-429
SUMMARY: An investigation into causes of low lamb marking percentages was made on a property in north-west New South Wales from 1971 to 1975. Investigations revealed that from 11 to 70% of the ewes in lamb were losing all their lambs. Observations suggested that feral pig predation was a factor in the perinatal loss.
In 1975, 2 groups of ewes were placed in adjoining paddocks prior to lambing. Feral pigs were excluded from one paddock for most of lambing by means of an electric fence. In this paddock, 117% of lambs were marked compared with 80% in the adjoining paddock. It was estimated that in 1975 over 600 lambs were killed by feral pigs from 1,422 ewes lambing in paddocks with feral pigs.
The problems involved in the diagnosis of feral pig predation are discussed. 相似文献
In 1975, 2 groups of ewes were placed in adjoining paddocks prior to lambing. Feral pigs were excluded from one paddock for most of lambing by means of an electric fence. In this paddock, 117% of lambs were marked compared with 80% in the adjoining paddock. It was estimated that in 1975 over 600 lambs were killed by feral pigs from 1,422 ewes lambing in paddocks with feral pigs.
The problems involved in the diagnosis of feral pig predation are discussed. 相似文献
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The effect of tilmicosin administered to ewes prior to lambing on incidence of clinical mastitis and subsequent lamb performance 
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下载免费PDF全文 Croft A Duffield T Menzies P Leslie K Bagg R Dick P 《The Canadian veterinary journal. La revue veterinaire canadienne》2000,41(4):306-311
The effect of tilmicosin on the incidence of clinical mastitis and subsequent lamb performance was studied in 9 sheep flocks in Ontario. Ewes were treated randomly with either tilmicosin or placebo approximately one month prior to lambing. Outcome was assessed by comparing rates of clinical mastitis, palpable udder abnormalities, and preweaning (50-day) lamb weights between the 2 treatment groups, while controlling for other important variables. Lambs raised by multiparous ewes treated with tilmicosin were significantly heavier than lambs from placebo-treated multiparous ewes at 50 days. Lambs from tilmicosin-treated ewes were on average 0.52 kg heavier than lambs in the placebo group. There was no difference between treatment groups in the weight of lambs from first parity ewes. Tilmicosin treatment resulted in a 43% decrease in palpable udder abnormalities. Incidence of clinical mastitis did not differ between experimental groups. The administration of tilmicosin prelambing, at the time of routine clostridial disease vaccination, may be a beneficial and convenient way to reduce mastitis infection and improve the preweaning gain of lambs. 相似文献
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An m:n matched case–control study was conducted to identify risk factors for ovine clinical mastitis (CM). Data were from a national sheep registry and only ewes that lambed in the spring of 2004 were included. Eligible cases (n = 2857) and controls (n = 76,716) from 1056 flocks of meat sheep were matched on flock and conditional logistic regression was used for analysis of the data. CM risk was associated with age of the ewe and whether or not assistance at lambing was needed owing to dystocia; however, the effects of both these factors were modified by the number of lambs born. In ewes with 1 lamb, increasing age was associated with increased odds of CM (OR = 1.2 for each 1-year increase), while only a slight numerical increase in the odds was observed in ewes with >1 lamb. Dystocia was associated with increased odds of CM in ewes with 1 lamb (OR = 1.7) or 2 lambs (OR = 1.4), while no association was observed in ewes with >2 lambs. The odds of CM increased markedly with increasing number of lambs born to the ewe. For example, odds for 2-year-old ewes without dystocia were 6.7 times greater for those with >3 lambs than for those with 1 lamb. Compared with ewes of old Norwegian breeds, ewes of other breeds were more likely to experience CM (OR = 1.7). Ewes treated for CM at least once during the preceding 3 years had 4.0 times greater odds of CM compared with ewes without a CM history. It is likely that the effect estimates from this study, which are adjusted for breed and unaffected by inter-flock variations, are valid also for other meat sheep populations. 相似文献