Eighteen cyclic Shiba goats were used in this study. Estrus was synchronized with a single injection of 125 microg of a synthetic analogue of prostaglandin F(2)alpha (PGF(2)alpha) after detection of at least one corpus luteum by B-mode ultrasonography. Blood samples were collected from each animal on days 0, 7 and 21 post-mating for progesterone assay. Animals in estrus were either allowed to b...

The study was conducted to explore various aspects of reproduction in camels viz. Effect of breed on fertility, effect of repeat services during same estrous period on pregnancy rate, effect of copulation time on fertility in female dromedary camels, early versus late onset of sexual libido in males, male fertility and investigations into mating ability, semen donation efficiency in Artificial ...

The aim of this study was the effect pre-synchronization blood BHBA level on pregnancy rates sheep in non-breeding season. For purpose, 100 Merino/Merino crossbred ewe, aged 2-4 years, who have given one birth before, were used study. synchronization purposes, progesterone containing sponges 60 mg Medroxyprogesteron acetate (MPA) analogue, administered intravaginally for 14 days. (betahydroxybu...

Nematodes have diverse reproductive strategies, which make them ideal subjects for comparative studies to address how mating systems evolve. Here we present the sex ratios and mating dynamics of the free-living nematode Rhabditis sp. SB347, in which males, females and hermaphrodites co-exist. The three sexes are produced by both selfing and outcrossing, and females tend to appear early in a mot...

The effect of age at the first mating and herd size were evaluated in the reference Spanish Databank (BDporc) of 37 698 sows born between 1991 and 1995 and with individual lifetime records. The data included dates of births at entrance and culling, first mating, repetitive mating and conception, first farrowing and weaning records. Individual records were validated before the analysis by screen...

The aim of this study was to evaluate the reproductive efficiency of short and long term treatment with progestagens in addition to pregnant mare serum gonadotropin (PMSG) in Arabian ewes during the non-breeding season. A total of 56 ewes were divided into three groups: in group I vaginal sponges (60 mg medroxy progesterone acetate; MAP) were applied and removed after 6 days; in group II, vagin...

Procedures for breeding value estimation for reproductive traits under pasture mating conditions were developed and tested using a computer simulation model of genetic control of bovine reproduction. The model generated annual calving rates (BCR) (0 or 1) and calving dates (CD) for each cow as a function of underlying genetic variation in two independent traits: single-service conception rate, ...

introduction secondary sex ratio (ssr) is the proportion of males to females at birth. it has been shown in many different mammalian species, many factors are associated with ssr. changes in secondary sex ratio in dairy cows is considered economically important and the ability to change it could affect the revenues and profitability of a dairy farm. thus, sperm or embryo sexing techniques in re...