Effect of calf sex on some productive, reproductive and health traits in Holstein cows
نویسندگان
چکیده
منابع مشابه
Effect of temperature-humidity index on productive and reproductive performances of Iranian Holstein cows
Calving records from April 1996 to December 2005 comprising 31863 calving events of 1173 dairy cows in a large commercial dairy herd were used to evaluate the effects of heat stress, using temperature-humidity index (THI) on milk yield and composition and reproductive performance of Holstein dairy cows under humid climatic conditions of Rasht in Iran. THI values were grouped into six groups: 30...
متن کاملEffect 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 کاملgenetic evaluation of productive and reproductive traits of holstein dairy cows in the north of iran
in the present study, to estimate genetic parameters and genetic and phenotypic trends in holstein dairy cows in the north of iran, the records from first lactation of 11398 collected from 1989 to 2006 were used. records were collected from 290 herds. productive traits were 305 day-2x adjusted milk and fat yield and reproductive traits were age at first calving, calving interval and dry days. g...
متن کاملEvaluation of the effect of twin births on the perinatal calf mortality and productive performance of Holstein dairy cows
Calving records from the Animal Breeding Center of Iran collected from January 1993 to December 2007 and comprising 1 163 594 Holstein calving events from 2 552 herds were used to evaluate reported perinatal calf mortality, 305-d milk yield, 305-d fat yield of milk and 305-d fat percentage of milk in singleand twin-births. A logistic regression model was constructed to analyze calf mortality be...
متن کاملeffect of temperature-humidity index on productive and reproductive performances of iranian holstein cows
calving records from april 1996 to december 2005 comprising 31863 calving events of 1173 dairy cows in a large commercial dairy herd were used to evaluate the effects of heat stress, using temperature-humidity index (thi) on milk yield and composition and reproductive performance of holstein dairy cows under humid climatic conditions of rasht in iran. thi values were grouped into six groups: 30...
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ژورنال
عنوان ژورنال: Spanish Journal of Agricultural Research
سال: 2015
ISSN: 2171-9292,1695-971X
DOI: 10.5424/sjar/2015132-6320