Fertility of Criollo and Junin Female Sheep in the Central Sierra of Peru (Fertilidad de Ovejas Criolla y Junin en la Sierra Central del Peru)

摘要

A group of 120 Criollo and 120 Junin ewes were used to measure the fertility levels. During three years (April 1981-April 1984), all animals were managed and grazed on native pasture as a single flock. Natural matings by breed for 65 days beginning on May 3, with 4 - 5% of fertile rams, were conducted. The second and third years, each age group was assigned to the next older age group. The Criollo sheep showed significantly lower fertility rate (64.7%) compared to Junin (84%). The abortion and prolificacy rates were low and similar among breeds.