Preliminary Study of Growth, Development, and Reproductive Indicators in Females of Six Sheep Biotypes in Uruguay

  • Georgget Banchero Instituto Nacional de Investigación Agropecuaria La Estanzuela. Ruta 50 km 11, Colonia, Uruguay.
  • Andrés Vázquez Instituto Nacional de Investigación Agropecuaria Las Brujas. Ruta 48 km 10,Canelones, Uruguay.
  • Graciela Quintans Instituto Nacional de Investigación Agropecuaria Treinta y Tres. Ruta 8 km 282,Treinta y Tres, Uruguay.
  • Gabriel Ciappesoni Instituto Nacional de Investigación Agropecuaria Las Brujas. Ruta 48 km 10,Canelones, Uruguay.
Keywords: ewe lamb, development, puberty, breeding season, ovulation rate

Abstract

First evaluations of the Prolific Sheep Project of Instituto Nacional de Investigación Agropecuaria (INIA, 2008-2011) demonstrated that the crossbred mothers Corriedale by East Frisian or Corriedale by Finnish Landrace weaned 60 % more lambs than pure Corriedale, and the crossbred mothers East Friesian by Finnish Landrace weaned 85 % more than pure Corriedale. To obtain information regarding the age when puberty begins, the breeding season, and the ovulation rate of these new biotypes, an experiment was carried out with 87 female lambs born the Spring of 2010. Two pure breeds: Corriedale (C.C) and East Friesian (M.M) and the following crosses: Finnish Landrace x Corriedale (F.C), East Friesian x Corriedale (M.C), ¾ East Friesian - ¼ Finnish Landrace (M.(F.M)), 7 / 8 Finnish Landrace - 1 / 8 Corriedale (F.(FxF.C)) were used. Female lambs with more than 75 % of East Friesian blood (M.M and M.(F.M)) had the highests percentages of puberty onset in their first year of life (> 90 %). Their breeding season was the widest with an average ovulation rate of 1.0. F.(FxF.C) lambs followed the previous ones in the percentage reaching puberty and the width of the breeding season with an average ovulation rate of 1.5. Breeding season of hoggets was similar for all biotypes, however, hoggets with Finn blood were outstanding by their high ovulation rate (1.9-2.8) followed by East Friesian (1.5-1.8) and Corriedale (1.3).

Downloads

Download data is not yet available.
Published
2020-10-24
How to Cite
1.
Banchero G, Vázquez A, Quintans G, Ciappesoni G. Preliminary Study of Growth, Development, and Reproductive Indicators in Females of Six Sheep Biotypes in Uruguay. Agrociencia Uruguay [Internet]. 24Oct.2020 [cited 9Aug.2022];18(2):117-27. Available from: http://agrocienciauruguay.uy/ojs/index.php/agrociencia/article/view/472
Section
Animal production and pastures