We carried out a tour-step test in which exercise was gradually intensified over a distance of 1000 m on a semielliptic sand track, in which the heart rate was 115-125 (120), 140-150(145), 165-175 (170) y 185-195 (190) ...

An echographic study was made for the diameter evaluation of the preovulatory follicle and the embryonic vesicle at 20 days postfertili¬zation on 21 Arab Thoroughbred. mares and S I Spanish grouped in primiparous and ...

The influence of age and number of heats in the fertility value of Arabian and Andalusian mares have been studied. The Arabian mares have a whole fertility value 11 % higher than the Andalusian ones. The fertility is low ...

The plasmatic progesterone levels in Arabian and Andalusian mares during the reproductive cycle have been studied. In the partum there is a significant décrease in plasmatic progesterone levels. During the heat these levels ...

Following the traditional method of exploitation, for a period of four years 165 Spanish-bred mares were observed. The heats. per month from January to June and the gestation rates in each month were determined. The number ...

The length of heat in Andalusian and Arabian mares, and the optimum day of breeding in the first postpartum heat, have been studied. In our results the average of all the heat was 5.78 + 1.54 days. No significant diferences ...