EFFECTS OF NON-GENETIC FACTORS ON PRE-WEANING GROWTH TRAITS IN DORPER SHEEP MANAGED INTENSIVELY IN CENTRAL MEXICO

Jesús Alberto Mellado, Victor Manuel Marín, José Luis Reyes-Carrillo, Miguel Angel Mellado, Leticia Romana Gaytán, Ma. de los Angeles De Santiago-Miramontes

Abstract


The objective of this study was to determine the non-genetic factors which a ect growth traits in Dorper lambs under intensive conditions. Nine hundred and ninety birth weight records and 851 weaning weight data from a commercial sheep farm were used. A model containing the e ects of year of birth, season of birth, litter size, dams' age and gender was used for identi cation of factors a ecting growth traits. Birth weight was highest (p < 0.05) in summer and lowest in winter and spring. Male lambs excelled females in birth weight, weaning weight, and average daily gain. Young dams produced o spring with a lower (p < 0.05) birth weight and weaning weight than older ewes As a conclusion, important in uences of environmental factors on growth traits were identi ed for Dorper lambs. 


Keywords


Birth weight; weaning weight;pre-weaning;weight gain; growth traits

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References


Afolayan RA, Adeyinka IA, Lakpini, CAM (2006) The estimation of live weight from body measurements in Yankasa sheep. Czech Journal of Animal Science 51: 343–348.

Benyi K, Norris D, Karbo N, Kgomo KA (2006) Effects of genetic and environmental factors on pre-weaning and post-weaning growth in West African crossbred sheep. Tropical Animal Health and Production 38: 547-554.




DOI: http://dx.doi.org/10.19136/era.a3n8.847

ECOSISTEMAS Y RECURSOS AGROPECUARIOS(ECOSYSTEMS AND AGRICULTURAL RESOURCES), Year 6, Issue 18, september-december 2019, is a triannual journal edited, published and distributed by the Universidad Juárez Autónoma de Tabasco, Av. Universidad s/n, Zona de la Cultura, Col. Magisterial, Villahermosa, Centro, Tabasco, CP. 86040, Tel (993) 358 15 00, www.ujat.mx, era@ujat.mx., era@ujat.mx. Editor-in-chief: Efraín de la Cruz Lázaro. Copyright No. 04-2013-120514213600-203, ISSN: 2007-901X, both granted by the Instituto Nacional del Derecho de Autor (National Institute of Copyright), with certificate of title and content No. 16540 granted by the Secretaría de Gobernación(Ministry of the Interior). Individual responsible for the last update of this issue was journal Editorial Assistant Lic. Misael Hernández Martínez, Av. Universidad s/n, Zona de la Cultura, Col. Magisterial, Vhsa, Centro, Tabasco, Mex. C.P. 86040; date of last modification, september 1, 2019.

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