秦皇岛地区波尔山羊及其杂交后代繁殖性能的研究

对秦皇岛市波尔山羊繁育改良中心的波尔山羊繁殖性能进行观察和研究。结果表明:(1)波尔山羊适宜的初配年龄:公羊应为15～18月龄;母羊应为10～12月龄。(2)波尔母羊一年四季均可发情,但多集中于秋季和初冬季节,尤其是秋季性活动旺盛。(3)波尔母羊平均发情周期为20.75d,范围在18～23d。(4)母羊的发情持续期为30～36h。(5)产后出现第一次发情的时间平均为102d左右。(6)头胎受胎率为100%,二胎受胎率为85.71%。(7)纯种母羊的妊娠期平均为151.37d,杂交后代妊娠期平均为150.22d。(8)不同胎次母羊的产羔率:纯种羊为162.16%,杂交后代羊为153.66%。不同季节母羊的产羔率:纯种羊的为164.10%,杂交后代羊的为158.54%。(9)产羔成活率:纯种羊为93.55%,杂交后代羊为98.46%。

STUDY ON REPRODUCTION PERFORMANCE OF BOER GOAT AND IT'S CROSS-FERTILIZED OFFSPRING IN QINHUANGDAO AREA

Reproduction performance of Boer goat raised at the Center of Boer goat Breeding and Improving in Qinhuangdao city was studied.Results show as following:(1)Appropriate age of initial hybridization of Boer goat:15-18 month age for buck ,and 10-12 month age for ewe .(2)Ewe Boer goat can have oestrus in each season of a year,however,it seems to appear oestrus mostly often in fall and early winter.Frequency of sexual intercourse for it is very high particular in autumn.(3)Estrus of ewe Boer goat ,rang from 18 to 23d, average as 20.75d.(4)Ewe has an persistent oestrus for 30～36h.(5)The average time when ewe of post partum appears first oestrus is approximately 102d.(6)Fecundation ratio of the first fetus of goat group account for 100%, the second account for 85.71%.(7)Gestation for purebred ewe and cross-fertilized offspring ewe average as 151.37d, 150.22d respectively (8)Proportion of lamb birth at different fetal order of ewe:purebred goat means 162.16%,and cross-fertilized offspring does 153.66%.Proportion of lamb birth of ewe in various season: purebred goat means 164.10%,and cross-fertilized offspring does 158.54%.(9)Survival rate for lamb birth :purebred goat reaches to 93.55%, and cross-fertilized offspring comes to 98.46%.