Amoah E A, Gelaye S, Guthrie P, Rexroad C E
Agricultural Research Station, Fort Valley State College, GA 31030-3298, USA.
J Anim Sci. 1996 Apr;74(4):723-8. doi: 10.2527/1996.744723x.
Reproductive data were collected on 608 female goats and their 1,147 offspring, involving 20 herds, from different geographical locations in Georgia for 3 yr. Results for seven breeds and a dairy crossbred revealed that most goats bred seasonally, commencing approximately in late June and reaching a peak in September to November. However, the Pygmy had an unusual peak of mating activity during summer (July). Gestation period ( +/- SE) was 150.6 +/- 2.64 d. Pygmies had the shortest gestation period, whereas Toggenburgs had the longest. Gestation period decreased as the litter of size of the doe increased (b = -.92 d/kid, P < .001) and increased slightly with increasing parity (b = .22 d/parity). December and January matings had the shortest gestation period. Litter size was 1.85 +/- .67, with twins being the most prevalent litter size. Litter size varied among breeds. The litter size increased with mating weight of the doe for most breeds (litter size increased approximately .02 kids/kg of mating weight). Birth weight was 3.24 +/- .64 kg and varied among breeds; Pygmy kids were lightest (1.7 kg) and Toggenburgs were heaviest (3.9 kg). Males were heavier than female kids. Birth weight decreased with the size of litter (approximately .45 kg/kid, P < .001).
在3年时间里，收集了来自格鲁吉亚不同地理位置的20个畜群中608只母山羊及其1147只后代的繁殖数据。对7个品种和一个奶牛杂交品种的研究结果显示，大多数山羊季节性繁殖，大约从6月下旬开始，9月至11月达到高峰。然而，俾格米山羊在夏季（7月）有一个不寻常的交配活动高峰。妊娠期（±标准误）为150.6±2.64天。俾格米山羊的妊娠期最短，而托根堡山羊的妊娠期最长。妊娠期随着母羊产仔数的增加而缩短（b = -0.92天/只羔羊，P < 0.001），并随着胎次的增加而略有增加（b = 0.22天/胎次）。12月和1月交配的母羊妊娠期最短。产仔数为1.85±0.67只，双胞胎是最常见的产仔数。产仔数因品种而异。大多数品种的产仔数随着母羊交配体重的增加而增加（产仔数大约每增加1千克交配体重增加0.02只羔羊）。出生体重为3.24±0.64千克，因品种而异；俾格米山羊的羔羊最轻（1.7千克），托根堡山羊的最重（3.9千克）。雄性羔羊比雌性羔羊重。出生体重随着产仔数的增加而降低（大约每只羔羊降低0.45千克，P < 0.001）。
