Bayesian segregation analysis of test-day milk yield in Tunisian Sicilo-Sarde dairy sheep
نویسندگان
چکیده
منابع مشابه
Ag-reml Estimation of Genetic Parameters for Total Milk Yield in Sicilo-sarde Sheep
Genetic parameters were estimated for total milk yield of a Sicilo-Sarde flock (INRAT (Tunisian National Institute of Agronomic Research) Experiment Station, Béja) for 881 lactations. Total milk yields were calculated from 8220 bimonthly test day records using the Fleischmann method. Animals included in the relationship matrix were 363 ewes and 83 rams. Estimates were from the use of univariate...
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Variace / covariance components of 227118 first lactaiom test-day milk yield records belonged to 31258 Iranian Holstein cows were estimated using nine random regression models. Afterwards, different measures of persistency based on estimation breeding value were evaluated. Three functions were used to adjust fixed lactation curve: Ali and Schaeffer (AS), quadratic (LE3) and cubic (LE4) order of...
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Using monthly test day records the genetic parameters of Iranian Holstein cattle in first lactation were studied. Data of 277400 test-day milk records from 65320 cows and 2210 sires were analyzed by an animal random regression model using restricted maximum likelihood methodology. The model included herd-test-date, interaction between year-season of calving, days in milk (linear and quadratic) ...
متن کاملNon-genetic sources of variation of milk production and reproduction and interactions between both classes of traits in Sicilo-Sarde dairy sheep.
This work aimed to study the sources of variation in productive and reproductive traits of the dairy Sicilo-Sarde ewes and to further investigate the interaction between both classes of traits. After edits, a database containing 5935 lactation records collected during 6 successive years in eight dairy flocks in the North of Tunisia was used. Total milked milk (TMM) in the milking-only period wa...
متن کاملEffect of the Concentrate Feed on in vitro Gas Production and Methane in Sicilo-Sarde Sheep
The addition of concentrates of different types (cereals, maize and white sorghum) in the diet of dairy sheep leads to changes in rumen parameters and the end products of digestion in particular the total gas production. The objective of the present work was the determination of total gas and methane production (CH4) in the rumen of Sicilo Sarde rams supplemented by different types of concentra...
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ژورنال
عنوان ژورنال: Journal of Animal and Feed Sciences
سال: 2011
ISSN: 1230-1388
DOI: 10.22358/jafs/66166/2011