Empadre controlado, distribución de partos y prolificidad en ovejas de pelo en el trópico seco de Guerrero, México

The objective of this retrospective study was to know the lasting of mating with the days of riding (DMWR), continuous presentation of mating, presentation of continuous mating births, controlled and the rate of prolificacy, through information from the records in a continuous breeding season in June 2002 to March 2003 and 11 controlled mating periods in September 2003 to December 2009 and their periods of birth, in a production unit in Ciudad Altamirano, Guerrero, Mexico, composed of 45 multiparous ewes, 15 lambs and a stallion pubescent. Were used two breed sire 6 Dorper 4 Black-Belly and 2 Pelibuey-Kathadin, The recording of data included: date of the periods of breeding, identification of sire, ewe, newborn, birth of date, and type of delivery, the deliveries were grouped per week and breeding season births quarterly , those from January-February-March and those from July- August-September accounted for three seasons each one , the October- November-December 5, the April-May- June, with an average for all these breedings in 1,56±0,17, the quarter accounted for a single mating an index of 2,0±0,68 and the lowest value was 1,40±0,54, corresponding to the quarters from October- November-December 2008 and July-August- September 2009, days of mating with mounts were into a range of 21-39 days. The deliveries of continuous mating occurred for over nine months, with a lambing rate of 1,55±0,70. The prolificacy when the sire Dorper were used was 1,66+018, for the Black Belly, and the Pelibuey-katadin was 1,45+0,05. The presentation of the breeding season births were concentrated in a 90,06% during the first four weeks of commencement of lambing, just 9,72 of the deliveries were made in the following month of the period of births.