Milk production and composition, and progeny performance in young ewes with high merit for rapid growth and muscle and fat accumulation

Animal : an International Journal of Animal Bioscience
C A Rosales NietoA N Thompson

Abstract

In ewe lambs, acceleration of growth and accumulation of both muscle and fat leads to earlier sexual maturity and better reproductive performance. The next stage in the development of this theme is to test whether these aspects of growth in young ewes affect milk production in their first lactation and the growth of their first progeny. We studied 75 young Merino ewes that had known phenotypic values for depth of eye muscle (EMD) and fat (FAT), and known Australian Sheep Breeding Values for post-weaning weight (PWT) and depths of eye muscle (PEMD) and fat (PFAT). They lambed for the first time at 1 year of age. Their lambs were weighed weekly from birth to weaning at 10 weeks to determine live weight gain and weaning weight. Progeny birth weight was positively associated with live weight gain and weaning weight (P0.05). The PWT of the sire was positively associated with live weight gain (P0.05). The concentrations of fat, protein, lactose and total solids in the milk were not affected by the phenotype or genotype of the mothers or of the sires of the mothers, or by the sex of the progeny (P>0.05). We conclude that selection of young Merino ewes for better growth, and more rapid accumulation of muscle and fat, will lead to proge...Continue Reading

References

Jul 25, 2000·Journal of Animal Science·M A LaneB W Jesse
Jul 6, 2004·Journal of Critical Care·Tasnim SinuffUNKNOWN Department of Medicine, McMaster University
May 4, 2010·L'Encéphale·J Marcel, Y Paquet
Feb 12, 2013·Animal : an International Journal of Animal Bioscience·C A Rosales NietoA N Thompson
May 21, 2015·Reproduction in Domestic Animals = Zuchthygiene·C A Rosales NietoA N Thompson
Feb 20, 2016·Tropical Animal Health and Production·César Augusto Rosales NietoShimin Liu
Nov 22, 2016·Animal : an International Journal of Animal Bioscience·A M PatenH T Blair

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Citations

Mar 8, 2020·Animals : an Open Access Journal From MDPI·Bo WangZhicheng Diao
Sep 30, 2020·Tropical Animal Health and Production·M J Flores-NajeraC A Rosales-Nieto
Nov 7, 2019·Animal : an International Journal of Animal Bioscience·C A Rosales NietoA Veiga-Lopez
May 7, 2019·Animals : an Open Access Journal From MDPI·Manuel Ochoa CorderoGraeme B Martin
Jun 11, 2020·Animals : an Open Access Journal From MDPI·Venancio Cuevas ReyesCesar A Rosales Nieto
Jan 28, 2021·Animals : an Open Access Journal From MDPI·Juan M Vázquez-GarcíaCésar A Rosales-Nieto
Nov 8, 2020·Domestic Animal Endocrinology·C A Rosales-NietoA Veiga-Lopez

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