Effect of culling open cows on reproductive performance
نویسندگان
چکیده
منابع مشابه
Effect of Puerperal Metritis on Holstein Cows Productive, Reproductive Variables and Culling Rates
The objective of the study was to determine the effect of puerperal metritis prevalence in high yielding Holstein cows on productive (305 days, actual milk yields), reproductive (days to first estrus, days open and services per conception) variables and culling rates. Throughout the study, 2885 dairy records were collected from high yielding private Holstein dairy farm (average milk yield was u...
متن کاملUterine Infections in Cows and Effect on Reproductive Performance
Uterine infections affect the hypothalamus, hypophysis, ovaries and uterus. These infections inhibit the development of dominant follicles, prevent both the release of the luteinizing hormone (LH) and ovulation, reduce the size of the corpus luteum (CL), and decrease progesterone production. As these infections reduce fertility or cause infertility, they result in major economic losses. The dia...
متن کاملEffect of bST and reproductive management on reproductive performance of Holstein dairy cows.
The objective was to determine the effects of bovine somatotropin (bST) and two artificial insemination (AI) protocols on reproductive performance of Holstein cows. Lactating cows (n = 840) were assigned at 37 d in milk (DIM) to one of four treatments in a 2 x 2 factorial arrangement. Treatments consisted of either bST (500 mg/14 d) starting at 63 +/- 3 DIM or no bST (control), with cows either...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Kansas Agricultural Experiment Station Research Reports
سال: 1975
ISSN: 2378-5977
DOI: 10.4148/2378-5977.2739