Environmental effects on ovulation rate in four spring-calving dairy herds with above-average twin calving rate
نویسندگان
چکیده
منابع مشابه
Associations 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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Sixty of the 65 dairy farms with cubicle houses in the Norwegian county of Oppland were included in a field study of the management of calving in 1990. The farmers recorded the location of the cow when giving birth, farmer presence and whether assistance was given during calving, occurrence of suckling, and time after birth when cow and calf were separated. Such data were recorded for a total o...
متن کاملPre-Calving and Calving Management Practices in Dairy Herds with a History of High or Low Bovine Perinatal Mortality
Bovine perinatal mortality is an increasing problem in dairy industries internationally. The objective of this study was to determine the risk factors associated with high and low herd-level calf mortality. Thirty herds with a history of either high (case) or low (control) calf mortality were recruited. A herd-level questionnaire was used to gather information on management practices likely to ...
متن کاملRelationship between dairy cow genetic merit and profit on commercial spring calving dairy farms.
Because not all animal factors influencing profitability can be included in total merit breeding indices for profitability, the association between animal total merit index and true profitability, taking cognisance of all factors associated with costs and revenues, is generally not known. One method to estimate such associations is at the herd level, associating herd average genetic merit with ...
متن کاملEffects of feeding energy or protein supplements before or after calving on performance of spring-calving cows grazing native range.
In three consecutive years, spring-calving Hereford and Hereford x Angus cows (n = 348) were used to determine effects of level of supplemental energy or protein before and after calving on cowherd performance. Beginning on November 1, cows were individually fed 1.22 kg/d of a 40% CP (PROTEIN) or 2.44 kg/d of a 20% CP supplement (ENERGY) until calving. After calving, cows remained on the same s...
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ژورنال
عنوان ژورنال: New Zealand Journal of Agricultural Research
سال: 1991
ISSN: 0028-8233,1175-8775
DOI: 10.1080/00288233.1991.10417683