Voluntary Waiting Period and Adoption of Synchronized Breeding in Dairy Herd Improvement Herds
نویسندگان
چکیده
منابع مشابه
Voluntary waiting period and adoption of synchronized breeding in dairy herd improvement herds.
Voluntary waiting period and adoption of synchronized breeding (ovulation synchronization followed by timed artificial insemination) were characterized from 33 million services of Holsteins and Jerseys in Dairy Herd Improvement herds. Calving month, calving year, and parity had large effects on days to first service for both breeds. Holstein cows that calved during March and April were bred lat...
متن کامل1999 Dairy Herd Improvement Herds in Arkansas
Successful dairy producers must have accurate and reliable records to make sound management decisions. The Dairy Herd Improvement (DHI) program provides a comprehensive herd analysis and management report that includes information concerning production, reproduction, genetics, herd health, animal and feed inventory, and finances. The data can be used to improve efficiency of milk production by ...
متن کاملEvaluation of two dairy herd reproductive performance indicators that are adjusted for voluntary waiting period
BACKGROUND Overall reproductive performance of dairy herds is monitored by various indicators. Most of them do not consider all eligible animals and do not consider different management strategies at farm level. This problem can be alleviated by measuring the proportion of pregnant cows by specific intervals after their calving date or after a fixed time period, such as the voluntary waiting pe...
متن کاملStatistical evaluation of factors and interactions affecting dairy herd improvement milk urea nitrogen in commercial midwest dairy herds.
In this study, 400,729 Dairy Herd Improvement (DHI) records collected on 77,178 cows in 692 Midwest herds over 29 mo (January 1999 to May 2001) were used to analyze milk urea nitrogen (MUN) as collected the day of the test in 6 breeds. Records of Holsteins, Jerseys, and Brown Swiss were subjected to stepwise backward elimination analysis with a model including parity (primiparous vs. multiparou...
متن کاملAssociations between herd size, rate of expansion and production, breeding policy and reproduction in spring-calving dairy herds.
Dairy herd size is expected to increase in many European countries, given the recent policy changes within the European Union. Managing more cows may have implications for herd performance in the post-quota era. The objective of this study was to characterise spring-calving herds according to size and rate of expansion, and to determine trends in breeding policy, reproduction and production per...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2007
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(07)71645-4