Genetic and phenotypic parameters for lactation traits in a flock of Saanen goats in Mexico |
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| Affiliation: | 1. Instituto de Ciencias Agrícolas, Universidad de Guanajuato. Ex-Hacienda El Copal, AP 311, Irapuato, Guanajuato, CP 36500, México;2. División de Ciencias Agropecuarias, Facultad de Estudios Superiores Cuautitlán, Campo 4, Universidad Nacional Autónoma de México. Km 2.5 carretera Cuautitlán-Teoloyucan, Cuautitlán Izcalli, Estado de México, CP 54700, AP 25;3. Departamento de Genética y Bioestadística, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México. Ciudad Universitaria 04510, Coyoacán, D.F., Apdo 70483, México;1. Laboratory of Animal Husbandry, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece;2. Department of Animal Science and Aquaculture, Agricultural University of Athens, Iera Odos, 11855, Greece;3. Veterinary Research Institute of Thessaloniki, Hellenic Agricultural Organization Demeter, Thermi, 57001, Greece;4. Scotland’s Rural College and The Roslin Institute, University of Edinburgh, Midlothian, EH25 9RG, United Kingdom;2. Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, viale dell''Università 16, 35020 Legnaro (PD), Italy;1. Federal University of Ceará; Federal University of Maranhão – Campus Imperatriz, Brazil;2. Brazilian Agricultural Research Corporation – EMBRAPA/National Goat and Sheep Research Center – CNPC, Brazil;3. UNESP – Faculdade de Medicina Veterinária e Zootecnia, Brazil;4. Brazilian Agricultural Research Corporation – EMBRAPA/National Goat and Sheep Research Center – CNPC, Brazil;5. Federal University of Ceará, Brazil;1. Programa de Pós-Graduação em Zootecnia, Universidade Federal da Paraíba, Brazil;2. Empresa Estadual de Pesquisa Agropecuária da Paraíba, Brazil;3. Departamento de Zootecnia, Universidade Federal da Paraíba, Brazil;4. CIISA-Faculdade de Medicina Veterinária, Universidade de Lisboa, Portugal;1. Grupo Meragem, Departamentos de Genética y de Producción Animal, Universidad de Córdoba, Campus de Rabanales, Córdoba, Spain;2. Departamento de Mejora Genética Animal, INIA, Madrid, Spain;3. Centro Regional de Selección y Reproducción Animal, CERSYRA-IRIAF, Valdepeñas, Spain;1. Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada, N1G 2W1;2. Department of Animal Sciences, Purdue University, West Lafayette, IN 47907;3. Canadian Centre for Swine Improvement Inc., Ottawa, ON, Canada, K1A 0C6;4. Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland |
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| Abstract: | Heritability, repeatability and genetic and phenotypic correlations of total milk production (TM), cumulated milk production to 120 days (M120) and lactation length (LL), were estimated from the analysis of 1413 records (566 does) obtained from a Saanen goat flock in Querétaro, Mexico, during 1991–1997. Variance components were estimated using a restricted maximum likelihood procedure and applying an animal model. The model included the fixed effects of year–season of kidding, litter size and age of doe, and random effects of animal, permanent environment and residual. For TM, M120 and LL estimates of heritability were 0.22 ± 0.07, 0.12 ± 0.05 and 0.04 ± 0.03, and of repeatability were 0.40, 0.27 and 0.11, respectively. Genetic correlations between TM and M120, TM and LL, and M120 and LL, were 0.98, 0.58 and 0.53, respectively. Phenotypic correlations ranged from 0.30 to 0.83. The correlated selection response for TM from indirect selection on M120 was 71.5% of that expected from direct selection. Efficient selection for TM is possible and M120 could be used as an early indicator of TM, due to the high indirect selection response calculated. |
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