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Prof. Maher Hasab El-Nabi Khalil :: Publications:

Title:
Estimation of breeding values for lifetime production traits using animal models in New Zealand White rabbits raised in high intensive system of production - 2001
Authors: Khalil M.H., Afifi E.A., Youssef Y.M.K., El-Raffa A.M.E., Farid A.
Year: 2001
Keywords: Rabbits, Lifetime production, breeding valuesAnimal model,
Journal: Egyptian Journal of Rabbit Science
Volume: 11
Issue: 1
Pages: 93-101
Publisher: Egyptian Rabbit Science Association
Local/International: Local
Paper Link:
Full paper Maher Hasab El-Nabi Khalil_2001 - Estimation of breeding values for lifetime production traits using animal models.pdf
Supplementary materials Not Available
Abstract:

Data on 14210 litters of New Zealand White rabbits produced by 2945 does mothered by 1613 dams and fathered by 842 sires were analysed to characterize animals of this breed genetically for lifetime production traits. Lifetime production traits measured per doe were total number born (TNB), total number born alive (INBA) and total number weaned (TNW) and length of *time production (-Ln. For animals with and without records, breeding values (PB LI for these traits were predicted using single-trait (SAM) and multi-trait (MAM) Animal Models taking into account the relationship coefficient matrix among animals (4-1). For the list of all animals with records, MAM generally recorded higher ranges in estimates of.PBV for all traits than those ranges estimated by the SAM The ranges in estimates of PBV obtained from the MAM vs SAM were 15.0 vs 8.2 bunnies jro TNB, 17.4 vs 9.8 bunnies for TNBA, 1640 vs 11.8 bunnies for TNW and 3.20 vs 2.86 month for LT. The numbers of sires recorded positive PBV when using the MAM were larger than those sires with positive estimates recorded by the SAM The percentages of sires common between the SAM and MAM were relatively moderate and ranged from 19.0 to 52.4% for different traits studied, while the percentages of sires remaining in the same position when using the two models were very low and ranged from 0.0 to 2.4%. Estimates of PBV obtained by the MAM and SAM for animals without records (paternal grand-sires and paternal grand-dams) had the same trend obtained for the animals with records. Also, the percentages of paternal grand-sires or paternal grand-dam which were common between the SAM and MAM were moderate or high and ranged from 15.4 to 69.2%.

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