Adjustment of heterogeneous variance by milk production level of dairy herd
نویسندگان
چکیده
منابع مشابه
Dairy operation management practices and herd milk production.
A national US survey collected data on herd milk production and management of Holstein herds. Step-wise selection identified management practices that were related to herd milk production using only operations that calculated herd milk production as well as using data from all operations. Results were similar. Milk production was highest in the West. Operations with < 100 dairy cows had lower p...
متن کاملthe effects of high non fibrous carbohydrates diet on milk production, inflammation and molecular mechanism of innate immunity in lactating dairy cows
پژوهش حاضر با هدف بررسی اثر جیره حاوی کربوهیدراتهای غیرالیافی زیاد و بروز التهاب در گاوهای شیرده در دو آزمایش جداگانه انجام شد. در آزمایش اول 20 رأس گاو مبتلا به ورم پستان از دو گروه کم تولید و پرتولید (هر کدام 10 رأس) و 20 رأس گاو سالم از دو گروه کم تولید و پرتولید (هر کدام 10 رأس) انتخاب شدند. همه گاوها در دوره دوم و یا سوم شیردهی و در روزهای 80-120 پس از زایش بودند. میانگین تولید شیر در گروه...
Optimal growth of heifers and effect of milk yield level on dairy herd production, reproduction, and profitability
متن کامل
Hierarchical Bayesian Methods to Model Heterogeneity in Cow- and Herd-level Relationships between Milk Production and Reproduction in Dairy Cows
Two of the most important broad classifications of phenotypes for successful dairy production are milk yield and fertility. The nature of the relationship between milk production and reproductive performance of dairy cows is uncertain due to conflicting results reported in many studies. A common deficiency in many such studies is an underappreciation of the dual dimension of the production-repr...
متن کاملDuration of herd participation in dairy herd improvement milk recording in the United States.
Participation in milk-recording programs that provide data for national genetic evaluations of dairy cattle in the United States is voluntary, but the effectiveness of the evaluation system increases with the number of herds that contribute data. To investigate patterns of herd participation in Dairy Herd Improvement (DHI) testing, periods of continuous testing were computed based on the year t...
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ژورنال
عنوان ژورنال: Journal of the Korean Data and Information Science Society
سال: 2014
ISSN: 1598-9402
DOI: 10.7465/jkdi.2014.25.4.737