Baiden R Y
Animal Research Institute (CSIR), PO Box AH 20, Achimota, Accra, Ghana.
Trop Anim Health Prod. 2007 Feb;39(2):141-7. doi: 10.1007/s11250-007-4354-7.
A study was conducted on 441 West African Dwarf goat (WADG) kids born from September 1999 to August 2002 at three locations in the Dangme West District of the Greater Accra Region in Ghana to determine the effect of environmental factors on birth weight, birth type and pre-weaning survivability. The overall mean birth weight was 1.32 +/- 0.01 kg. Birth weights were similar (p > 0.05) between single births (1.43 +/- 0.04 kg) and twins (1.34 +/- 0.03 kg), but singles were significantly heavier (p < 0.05) than triplets (1.24 +/- 0.05 kg). Kids born in the major wet season recorded the best mean birth weight (1.37 +/- 0.04 kg). Sex, parity of does, and year of birth of kids had no significant (p > 0.05) effect on birth weight. Mean litter size was 1.93 +/- 0.03. Does that kidded in the dry season had a significantly (p < 0.05) higher litter size (2.05 +/- 0.06) than those that kidded in the minor wet season (1.80 +/- 0.10). Litter size of first-parity kids was significantly smaller (p < 0.05) than in subsequent parities. Litter size dropped significantly (p < 0.05) from year 2 (2.03 +/- 0.07) to year 3 (1.83 +/- 0.07). Pre-weaning survivability was 79.1% and season of kidding had a significant (p < 0.05) effect on survivability. Survivability of quadruplets (61.8%) was significantly (p < 0.05) lower than in the other birth types.
1999年9月至2002年8月期间，在加纳大阿克拉地区丹格梅西区的三个地点，对441只西非矮山羊（WADG）幼崽进行了一项研究，以确定环境因素对出生体重、出生类型和断奶前存活率的影响。总体平均出生体重为1.32±0.01千克。单胎（1.43±0.04千克）和双胎（1.34±0.03千克）的出生体重相似（p>0.05），但单胎比三胞胎（1.24±0.05千克）显著更重（p<0.05）。在主要雨季出生的幼崽平均出生体重最佳（1.37±0.04千克）。幼崽的性别、母羊的胎次和出生年份对出生体重没有显著（p>0.05）影响。平均产仔数为1.93±0.03。在旱季产仔的母羊产仔数（2.05±0.06）显著（p<0.05）高于在次要雨季产仔的母羊（1.80±0.10）。初产母羊的产仔数显著低于后续胎次（p<0.05）。产仔数从第2年（2.03±0.07）到第3年（1.83±0.07）显著下降（p<0.05）。断奶前存活率为79.1%，产仔季节对存活率有显著（p<0.05）影响。四胞胎的存活率（61.8%）显著低于其他出生类型（p<0.05）。
