Animal Bioscience

  • 제35권3호
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  • Pages.377-384
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  • 2022
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  • 2765-0189(pISSN)
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  • 2765-0235(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Genetic parameters for somatic cell score, milk yield and type traits in Nigerian Dwarf goats

  • Valencia-Posadas, Mauricio (Departamento de Veterinaria y Zootecnia, Division de Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato) ;
  • Lechuga-Arana, Alma Arianna (Programa de Doctorado en Biociencias, Division de Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato) ;
  • Avila-Ramos, Fidel (Departamento de Veterinaria y Zootecnia, Division de Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato) ;
  • Shepard, Lisa (American Dairy Goat Association) ;
  • Montaldo, Hugo H. (Departamento de Genetica y Bioestadistica, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria)
  • 투고 : 2021.03.28
  • 심사 : 2021.05.24
  • 발행 : 2022.03.01
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초록

Objective: This study was conducted to estimate multi-trait genetic parameters for somatic cell score (SCS), milk yield and type traits in Nigerian Dwarf (ND) goats from the United States. Methods: Data from 1,041 ND goats in the United States with kiddings in 95 herds were used to estimate multi-trait genetic parameters for SCS, milk (MILK), fat (FAT), and protein (PROT) yields, and 14 type traits. An 18-trait mixed linear animal model for lactation mean SCS (Log2), MILK, FAT, PROT, and 14 type traits was applied. A factor analytic approach (FA1) in ASReml software was used to obtain convergence. Results: Averages for SCS were low (2.85±1.29 Log2), and were 314±110.6, 20.9±7.4, and 14±4.9 kg, respectively, for MILK, FAT, and PROT. Heritabilities for SCS, MILK, FAT, and PROT were 0.32, 0.16, 0.16, and 0.10, respectively. The highest heritabilities for type traits were for stature (0.72), teat diameter (0.49), and rump width (0.48), and the lowest estimates were for dairyness (0.003) and medial suspensory ligament (0.03). Genetic correlations of SCS with MILK, FAT, and PROT were positive but low (0.25, 0.18, and 0.23, respectively). Genetic and phenotypic correlations between MILK, FAT, and PROT were high and positive (≥0.66). Absolute values of genetic correlations involving SCS with type traits were generally low or no different from zero. Most of the phenotypic correlations involving SCS with type traits were low. No serious unfavorable genetic correlations between milk yield traits and SCS or between milk yield traits or SCS and type traits were found. Conclusion: Genetic variation exists in the ND breed for most studied traits. The development of selection programs based on these estimates may help accelerate favorable multi-trait genetic changes in this breed.

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과제정보

We would like to thank American Dairy Goat Association and George Wiggans from AIPL-USDA for providing data; Arthur Gilmour for his generous and crucial advice on ASReml analysis, and Kristine Ibsen for her assistance with the English edition of the manuscript. M. V.-P., F. A.-R. and H. H.M. are members of the National System of Researchers from CONACYT, Mexico.

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