Response to selection for milk yield traits in Egyptian buffalo [electronic resource].

By: Contributor(s): Language: English Summary language: Arabic Description: P. 85-92Other title:
  • إستجابة الإنتخاب لصفات إنتاج اللبن فى الجاموس المصرى [Added title page title]
Uniform titles:
  • Egyptian journal of animal production, 2010 v. 47 (2) [electronic resource].
Subject(s): Online resources: In: Egyptian Journal of Animal Production 2010.v.47 (2)Summary: The aim of the present study was to estimate the genetic response to improve milk yield traits (milk, fat and protein) in Egyptian buffalo. Seven selection indices were constructed from data of 699 lactations of 478 buffalo daughter of 82 sires and 383 dams. The first index (ll) which included all milk yield traits was assumed to be the base of comparison while the rest indices are defined as reduced ones. Genetic parameters were estimated by a multiple-trait repeatability animal model using restricted maximum likelihood (REML) procedure. The model included herd year-season of calving and age nested within lactation for the first three lactations as fixed effects and additive genetic and permanent environment as random effects. Results indicated that selection to improve milk yield traits might be achieved through multiple-trait selection. Therefore, a selection index including MY (I1, I2, I3 or I5) was recommended as the best criterion from both the economic and the practical points of view to improve milk yield traits of Egyptian buffaloes. Using I5 which includes only milk yield, as a criterion of selection results in an increase of the expected genetic response for MY, FY and PY. For local breeders, I5 could be considered as the best criterion from the practical point of view and easy to apply.
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The aim of the present study was to estimate the genetic response to improve milk yield traits (milk, fat and protein) in Egyptian buffalo. Seven selection indices were constructed from data of 699 lactations of 478 buffalo daughter of 82 sires and 383 dams. The first index (ll) which included all milk yield traits was assumed to be the base of comparison while the rest indices are defined as reduced ones. Genetic parameters were estimated by a multiple-trait repeatability animal model using restricted maximum likelihood (REML) procedure. The model included herd year-season of calving and age nested within lactation for the first three lactations as fixed effects and additive genetic and permanent environment as random effects. Results indicated that selection to improve milk yield traits might be achieved through multiple-trait selection. Therefore, a selection index including MY (I1, I2, I3 or I5) was recommended as the best criterion from both the economic and the practical points of view to improve milk yield traits of Egyptian buffaloes. Using I5 which includes only milk yield, as a criterion of selection results in an increase of the expected genetic response for MY, FY and PY. For local breeders, I5 could be considered as the best criterion from the practical point of view and easy to apply.

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