We previously reported that ovulation rate, but not pregnancy rate or litter size at d 30 post-mating, was enhanced by gonadotropin treatment (P.G. 600; Intervet America Inc., Millsboro, DE) in gilts fed a progestin (Regu-mate; Intervet America Inc.) compared with gilts receiving progestin alone. We hypothesized that P.G. 600 altered the timing of ovulation, therefore mating gilts 12 and 24 h a...

A study was conducted to assess the effect of estrus synchronization technique on fertility and estrus induction response in crossbred cows under field conditions. Totally 30 infertile cows (anoestrous 13 and repeat breeder 17) were selected and divided randomly into two groups having 15 cows each. Estrus synchronization protocol (Triu-B) was adopted in Group I and Group II cows were kept as co...

Control of estrus is essential for the efficiency of any breeding program in farm animals, artificial insemination, hand mating and prediction of parturition dates. The present study is providing new evidence about determination of silent estrus in Damascus does. Since many D. does do not show any interest toward the male across seasons compared with spontaneous estrus detected by buck goat (BG...

Indications for estrus induction in the bitch include missed breeding opportunities or conception failure, the treatment of primary or secondary anestrus and synchronization of ovulation for embryo transfer programs. Reported methods for canine estrus induction include the use of synthetic estrogens (diethylstilbesterol), dopamine agonists (bromocryptine and cabergoline), GnRH agonists (lutreli...

The aim of the study was to investigate the sexual behavior and hormonal changes in Kıvırcık ewes synchronized during and out of the breeding season. Feeding, individual and eliminative behaviors of the ewes were also recorded. Group I ewes were synchronized during the breeding season and Group II ewes were synchronized out of the breeding season. At the end of synchronization protocol, ewes we...

Historically, the brain has been viewed as protected from the infiltration of peripheral hematopoietic cells by the blood-brain barrier. However, numerous immune cell types have been found in the central nervous system (CNS). Mast cells, granulocytic immune cells, are found in the CNS of birds and mammals and their numbers and location are influenced by both extrinsic and intrinsic factors, inc...

The objective of this study was to determine if pregnancy rates (PR) differed between beef heifers bred to fertile bulls on either their puberal (E1, n = 89) or third (E3, n = 67) estrus. Heifers were obtained from two lactations (Manhattan, L1; and Miles City, L2), and the experiment was conducted at Miles City. Heifers were assigned randomly within location to either E1 or E3. Heifers were fe...

Both epidermal growth factor (EGF) and transforming growth factor (TGF) play an important physiological role in the processes of proliferation and differentiation of several different cell types. However, the expression profiles of these factors in domestic bitches endometrium are still poorly recognized. The aim of the present study was to identify and analyze the differential expression of th...

Currently, reproductive failure is the first reason for involuntary culling, which stresses the economic importance of improving fertility. Estrous synchronization programs have been researched extensively since the mid 1990’s (Pursley et al. 1995; Moreira et al., 2001; Dewey at al., 2010) with the main objective of improving artificial insemination (AI) submission rate, decrease intervals betw...

This trial evaluates reproductive performance in a early-routine estrus synchronization program using two different PGF2? . Cows were administered D(+)cloprostenol sodium (n=88; Group A) or dinoprost (n=78; Group B) between 35-42d postpartum. Pedometers were used to detect estrus. Evaluation of secondary signs of estrus and evaluation of vaginal mucus quality was made prior to AI. When estrus w...