Pelibuey Ewe Productivity and Subsequent Pre-weaning Lamb Performance Using Hair-sheep Breeds Under a Confinement System

Abstract

Macías-Cruz, U., Álvarez-Valenzuela, F.D., Correa-Calderón, A., Molina-Ramírez, L., González-Reyna, A., Soto-Navarro, S. and Avendaño-Reyes, L. 2009. Pelibuey ewe productivity and subsequent pre-weaning lamb performance using hair-sheep breeds under a confinement system. J. Appl. Anim. Res., 36: 255–260.

The purpose of this study was to evaluate the effect of hair sheep sires on reproductive performance of Pelibuey ewes and to compare pre-weaning growth traits of their offspring. Forty-three Pelibuey ewes were randomly distributed in 3 groups to be mated by 3 breed sires (Dorper, Dr; Katahdin, Ka and Pelibuey, Pb). Fertility, fecundity and prolificacy were similar (P>0.05) among the three breed sires. In ewes mated to Dr, gestation length was 1.8 and 3.3 d shorter (P<0.01) than those mated to Ka or Pb sires, respectively. Birth weight, weaning weight and average daily gain up to weaning were higher among single born Ka lambs. Weaning litter weight per ewe lambing was greater (P<0.04) in ewes mated to Dr and Ka sires. In conclusion, Pelibuey ewes under a confinement system crossed with Dr or Ka sires improved their reproductive efficiency; moreover, pre-weaning traits of their lambs were also improved.

Keywords:

• Sheep
• Katahdin
• Pelibuey
• Dorper
• cross breeding
• pre-weaning performance