from Operation-management factors associated with early-postnatal mortality of US foals, Losinger WC, Traub-Dargatz JL, Sampath RK, Morley PS, Preventive Veterinary Medicine, 47 (2000) 157-175, November 2000. Persistent BVD infection in US beef herds In 1996, testing for BVD persistent infection was carried out on 18,931 spring born calves in 128 beef herds. Of these herds, 76 were randomly sel...

Interest in the preservation of endangered breeds such as the Blanca Andaluza goat, has increased and some steps should be therefore taken to ensure it. The study was designed to determine the seasonal reproductive pattern of Blanca Andaluza bucks, and whether this affects the quality of their semen and its freezability over the year. Seven bucks were used and their body weight, testicular weig...

Results on procedures for freezing stallion semen and the subsequent fertility during 20 years are presented. The present system applied in French National Stud includes: (1) a freezing protocol (dilution in milk, centrifugation and addition of freezing extender (INRA82+egg yolk (2%, v/v)+glycerol (2.5%, v/v) at 22 degrees C, a moderate cooling rate to 4 degrees C and freezing at -60 degrees C/...

the aim of the current study was to evaluate the effects of the guanidinoacetic acid (gaa) supplement on the semen freezability of broiler breeder roosters. experiments were performed with twenty ross commercial strain broiler breeder roosters in four treatments and five repeats in a complete randomized design. roosters were fed a diet containing 0% (control), 0.06%, 0.12% and 0.18% gaa supplem...