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首页> 外文期刊>Indian Journal of Small Ruminants >Genetic analysis of milk production traits in Jamunapari goats.
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Genetic analysis of milk production traits in Jamunapari goats.

机译：Jamunapari山羊产奶性状的遗传分析。

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摘要

Data on 2612 lactations from 990 does kidding from 1993 to 2010 at the Central Institute for Research on Goats, Makhdoom (Uttar Pradesh) were analyzed for milk yield (MY) at 90 days, 140 days, total lactation milk yield (TMY) and lactation length. The corresponding least squares means were 78.30+or-0.68, 111.42+or-1.50, 117.19+or-1.24 litres and 156.37+or-1.21 days, respectively. Period of kidding, parity and weight of dam at kidding affected the lactation traits significantly (P<0.01). Seasons of kidding and type of kidding were also (P<0.05) significant sources of variation for 90 and 140 days milk yields. Lactation length was affected by season of kidding only. Goats kidding during spring yielded more (P<0.05) milk at 90 days whereas higher (P<0.05) lactation length was observed in autumn kidders. Goats which delivered multiple births produced more milk (P<0.05) than those delivered single birth. Goats with higher body weight at kidding (P<0.05) produced more milk. The genetic correlations among milk production traits were high and ranged from 0.451+or-0.557 (90d-MY and 140d-MY) to 0.866+or-0.128 (90d-MY and TMY). The estimates of h2 for lactation traits were low. Small population size, low voluntary culling of females and lower intensity of selection for lactation traits might be the probable reasons for low genetic variability and inconsistent milk production performance in this flock.
机译：分析了1993年至2010年在中央研究院山羊（Makhdoom，北方邦）990只山羊中有2612只泌乳的数据，分析了90天，140天的泌乳量（MY），总泌乳量（TMY）和泌乳长度。相应的最小二乘均数分别为78.30+或-0.68、111.42+或-1.50、117.19+或-1.24升和156.37+或-1.21天。开玩笑时间，开玩笑的均价和体重对泌乳性状有显着影响（P <0.01）。开玩笑的季节和开玩笑的类型也是90天和140天产奶量变化的重要原因（P <0.05）。哺乳期仅受开玩笑的季节影响。春季开玩笑的山羊在90天时产奶量更多（P <0.05），而秋季开玩笑者的泌乳期更长（P <0.05）。分娩的山羊比分娩的山羊生产更多的牛奶（P <0.05）。在开玩笑时体重较高的山羊（P <0.05）产生更多的牛奶。产奶性状之间的遗传相关性很高，范围从0.451+或-0.557（90d-MY和140d-MY）到0.866+或-0.128（90d-MY和TMY）。 h 2 对泌乳性状的估计很低。人口少，雌性自愿淘汰率低以及对泌乳性状的选择强度低可能是该群体遗传变异性低和产奶性能不一致的可能原因。

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