Published in Scientific Papers. Series D. Animal Science, Vol. LXVII, Issue 1
Written by Osamah Mahmood Abdul Zahra MURSHEDI, Horia GROSU
The purpose of this study is to optimize the selection plan for production and reproduction traits in the milk-Palas sheep population totally 486 sheep. The selection criterion is represented by an estimate of the global breeding value, calculated based on the BLP method. Among the four traits considered in terms of economic weights, the most important in the selection turned out to be prolificacy (55%), followed by the amount of milk (24%), the amount of fat (12%) and the amount of protein (9%). The greatest genetic progress per generation was obtained in the case of variant 5 (Milk + Fat + Protein + Prolificacy), the genetic gain being 7.6623 kg milk and of 0.0407 lambs/calving. Compared to the control variant (1), the total genetic gain increased by 102.8%. The next variant is variant 2 (Milk + Fat + Prolificacy), which practically ensures a genetic gain similar to variant 5, namely 102.7%. This result is explained by a higher genetic correlation between the amount of milk and the amount of fat (0.836) compared to the value of the correlation between the amount of milk and the amount of protein (0.441).
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