Decreased fertility with increasing parity in lactating dairy cows

被引：26

作者：

Balendran, A. ^{[1
]}

Gordon, M. ^{[1
]}

Pretheeban, T. ^{[1
]}

Singh, R. ^{[1
]}

Perera, R. ^{[1
]}

Rajamahedran, R. ^{[1
]}

机构：

[1] Univ British Columbia, Fac Land & Food Syst, Vancouver, BC V6T 1Z4, Canada

来源：

CANADIAN JOURNAL OF ANIMAL SCIENCE | 2008年 / 88卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Pregnancy rate; progesterone; parity; cows; heifers;

D O I：

10.4141/CJAS07127

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Balendran. A., Gordon, M., Prethecban, T., Singh. R., Perera, R. and Rajamahedran, R. 2008. Decreased fertility with increasing parity in lactating dairy coils. Can. J. Anim. Sci. 88: 425-428. The relationships of parity and progesterone (P-4) concentrations during the bred cycle with pregnancy rate (PR) were examined in this study. Breeding records of 163 Holstein heifers and cows (in 1st parity, 2nd parity. and 3rd or 4th parity) from the Uuniversity of British Columbia Dairy Education and Research Centre were used to compare PR among heifers, 1st, 2nd and 3rd/4th parity cows. Blood or milk samples collected from 10 animals of each treatment group were assayed to compare P-4 concentrations among treatment groups. Statistical analysis showed that the heifers' first insemination PR (67.9%) was higher (P<0.05) from 1st parity (42.9%). 2nd parity, (20.0%) and 3rd/4th parity cows (11.9%). P-4 concentrations were not significantly different (P>0.05).

引用

页码：425 / 428

页数：4

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