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Heritability Estimates of Lactation Traits in Maltese Goat
Abstract:Data on 657 lactation from 163 Maltese goat, collected over a 5-year period were analyzed by a mixed model to estimate the variance components for heritability. The considered lactation traits were: milk yield (MY) and lactation length (LL). Year, parity and type of birth (single or twin) were significant sources of variation for lactation length; on the other hand milk yield was significantly influenced only by the year. The average MY was 352.34 kg and the average LL was 230 days. Estimates of heritability were 0.21 and 0.15 for MY and LL respectively. These values suggest there is low correlation between genotype and phenotype so it may be difficult to evaluate animals directly on phenotype. So, the genetic improvement of this breed may be quite slow without the support of progeny test aimed to select Maltese breeders.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1057821Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1913
 D. Carnicella, M. Dario, M. C. C. Ayres, V. Laudadio, C. Dario, "The effect of diet, parity, year and number of kids on milk yield and milk composition in Maltese goat," Small Rum. Res. vol. 77, June 2008, pp. 71-74.
 SAS, 1999. SAS/STAT, User-s Guide, Version 8, (SAS Institute, Cary, NC).
 W. A. Becker, "Estimation of variance components and heritability". in: Manual of Procedures in Quantitative Genetics. 2nd ed. The Program in Genetics. Washington State University, Puyallup, WA, 1968, pp 7-59.
 A. P. Mavrogenis, A. Constantinou and A. Louca, "Environmental and genetic causes of variation in production traits of Damascus goats. 2. Goat productivity,". Anim. Prod. vol. 38, 1984, pp 99-104.
 A. P. Mavrogenis, C. Papachristoforou, P. Lysandrides and A. Roushias, "Environmental and genetic effects of udder characteristics and milk production in Damascus goats,". Small Rum. Res. vol 2, July 1989, pp 333-343.
 D. Boichard, N. Bouloc, G. Ricordeau, A. Piacere and F. Barillet, "Genetic parameters for first lactation dairy traits in the Alpine and Saanen goat breeds," Genet. Sel. Evol. vol 21, 1989 pp 205-215.
 S. N. Kala and B. Prakash, 1990. "Genetic and phenotypic parameters of milk yield and milk composition in two Indian goat breeds," Small Rum. Res. vol 3, Sept 1990, pp. 475-484.
 A. Rabasco, J. M. Serradilla, J. A. Padilla and A. Serrano, "Genetic and non-genetic sources of variation in yield and composition of milk in Verata goats," Small Rum. Res. vol 11, July 1993, pp 151-161.
 P. M. Valencia, L. J. Dobler and S. I. Arbiza, "Sources of environmental variation affecting lactation and pre-weaning growth characteristics in Saanen goats," Cuban J. Agric. Sci. vol 36, 2002, pp. 117-122.
 M. Valencia, J. Dobler and H. H. Montaldo, "Genetic and phenotypic parameters for lactation traits in a flock of Saanen goats in Mexico," Small Rum. Res. vol 68, Apr 2007, pp 318-322.
 M. U. Iloeje and L. D. van Vleck, "Genetics of dairy goats: A review," J. Dairy Sci. vol 61, Nov 1978, pp 1521-1528.
 M. Shelton, "Reproduction and breeding of goats," J. Dairy Sci. vol 61, July 1978, pp 994-1010.
 B. W. Kennedy, C. M. Finley and G. E. Bradford "Phenotypic and genetic relationships between reproduction and milk production in dairy goats," J. Dairy Sci. vol 65, Dec 1982, pp 2373-2383.
 A. Constantinou, R. Beuing and A. P. Mavrogenis, "Genetic and phenotypic parameters for some reproduction and milk production characters of the Damascus goat," Z. Tierzuechtg. Zuechtgsbiol. vol 102, 1985, pp 301-307.
 B. P. Sullivan, B. W. Kennedy and L. R. Schaeffer, "Heritabilities, repeatabilities and correlations for milk, fat and protein yields in goats," J. Dairy Sci. 69 (suppl. 1), 1986, p. 100.
 A. Constantinou, "Genetic and environmental relationships of body weight, milk yield and litter size in Damascus goats," Small Rum. Res. vol 2, July 1989, pp 163-174.
 S. Bishop, B. Sullivan and L. R. Schaeffer, "Genetic evaluation of Canadian dairy goats using test-day data," in: Milk and Beef Recording State of the Art, Proc. of the 29th Biennial Session of the International Committee for Animal Recording, Ottawa, Canada, 1994, pp. 299-302.
 S. Andonov, M. Kovac, D. Kompan and V. Dzabirski, "Estimation of covariance components for test day production in dairy goat," Proc. of 6th World Cong. Genet. Appl. Livest. Prod., 1998, pp 145-148.
 C. A. Morris, M. Wheeler and M. Lanuzel, (2006) "Genetic trend and parameter estimates for milk yield traits and kidding date in a Saanen goat herd in New Zealand". N.Z. J. Agric. Res. vol 49, June 2006, pp 175-181.
 E. C. Pimenta Filho, J. L. R. Sarmento, M.N. Ribeiro, "Efeitos genéticos e ambientais que afetam a produ├º├úo de leite e dura├º├úo da lacta├º├úo de cabras ,esti├ºas no estado da Para├¡ba," Rev. Bras. Zootec. vol 31, Nov/Dec, 2004 pp 1426-1431.