Survival in crossbred lambs: Breed and heterosis effects
Survival in crossbred lambs: Breed and heterosis effects
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DOI：
10.2527/jas.2014-8556
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发表时间：
2015-03-01
影响因子：
3.3
通讯作者：
Thomas, D. L.
中科院分区：
文献类型：
--
作者：
Ferreira, V. C.;Rosa, G. J. M.;Thomas, D. L.
本研究的目的是估计3个时间段内影响杂交羔羊存活率的遗传和非遗传效应：至1日龄（n = 7，933），2 - 30日龄（n = 5，370），2 - 60日龄（n = 5，216）的人口正在升级到奶牛品种的东弗里斯兰和Lacaune，羔羊人工饲养的牛奶发酵。使用1989年至2011年23年间出生的14，339只动物的系谱信息，分析了1998年至2011年14年间出生的羔羊的生存率。记录死亡日期、性别、母鼠年龄、出生类型、出生月份和年份以及品种组成，并计算每只动物的保留杂种优势比例。羔羊是2个或更多品种的杂交种，在种群中有14个品种。由于12个非乳制品品种的平均遗传贡献较低，因此将其分为2组：肉类品种（汉普郡、萨福克和特克塞尔）和母系品种（罗曼诺夫、芬兰羊、多塞特、Targhee、Rambouillet、Polypay、Katahdin、Arcott Rideau和商业）。个体保留杂种优势比例与羔羊2 ~ 30日龄和2 ~ 60日龄成活率呈显著正相关（P < 0.05）。与纯种羔羊相比，F-1羔羊存活率的预测增加分别为+8.8%和+14.6%。肉用种羔羊和母系种羔羊的预测存活率较高（P
The objective of this study was to estimate genetic and nongenetic effects affecting survival in crossbred lambs during 3 time periods: through 1 d of age (n = 7,933), 2 to 30 d of age (n = 5,370), and 2 to 60 d of age (n = 5,216) in a population being upgraded to the dairy breeds of East Friesian and Lacaune in which lambs were artificially reared on milk replacer. Survival was analyzed for lambs born in 14 yr from 1998 to 2011 using pedigree information from 14,339 animals born in 23 yr from 1989 to 2011. Date of death, sex, age of the dam, birth type, month and year of birth, and breed composition were recorded, and the proportion of retained heterosis was calculated for each animal. Lambs were crossbreds of 2 or more breeds with 14 breeds represented in the population. Due to low mean genetic contribution of the 12 nondairy breeds, they were placed into 2 groups: meat breeds (Hampshire, Suffolk, and Texel) and maternal breeds (Romanov, Finnsheep, Dorset, Targhee, Rambouillet, Polypay, Katahdin, Arcott Rideau, and Commercial). The proportion of individual retained heterosis was positively associated (P < 0.05) with lamb survival from 2 to 30 and from 2 to 60 d of age. The predicted increase in survival of F-1 lambs compared to purebred lambs was +8.8 and +14.6%, respectively. Predicted survival of meat breed lambs and maternal breed lambs was greater (P