STUDY ABOUT SOME FACTORS WHICH HAVE INFLUENCE ABOUT REPRODUCTION FUNCTION IN SHEEP
C. Pascal, Mihaela Ivancia, I. Gîlca, G. Nacu, L. Stancescu, Gh. Hrinca, N. Iftimie
The aim of these researches was practical and economical ways identification for increasing reproduction function. There were two major aspects: the puberty inducing for using female lamb to reproduction in first autumn and using natural factors influence for heats inducing and synchronizing to adults’ sheep. The biological material was Merinos from Palas-ecotyp Perieni, Karakul from Botosani and Turcana sheep. For puberty artificial inducing, young sheep was sheared about 40 days before mate and reproduction ram have been introduce in flock. The results show us for body weight in mate moment significant differences (p>0.01) just between Merinos from Palas and Karakul from Botosani sheep groups. The obtained differences for mate age and for calving age were insignificant for all groups for p>0.01. The study of natural factors what have a influence of heats inducing and synchronizing to adults’ sheep was made in 2 consecutive years, between July 10th and July 20th, when light and dark report is very close or is higher than 1/1. In this period, belated, semibelated and semiprecocious races can have sexual heats with a minimal possibility. The 54.28% sheep have heats from initial reproduction group from more precocious race, Merinos from Palas. 37.14% sheep were mated to Karakul from Botosani and 45.71% were mated to Tzurcana (semibelated races). The researches show us, also, the over season fecundity what was determined to semibelated local populations, the closely values to more precocious race (Merinos from Palas) (84.61% and 71.42%, for each studied year, to Turcana and 81,25% and 86,66% to Karakul from Botosani). The value and the level of obtained results demonstrate the possibility of young using since first year and justify the profitableness of heats inducing in over season.
Keywords: sheep, reproduction, photoperiod, puberty