The buffalo is an important livestock resource in several countries of South Asia and the Mediterranean regions. However, reproductive efficiency is compromised due to known problems of biological and management origins, such as lack of animal selection and poor nutrition. Under optimal conditions puberty is attained at 15 to 18 months in river buffalo, 21 to 24 months in swamp buffalo and is i...

We are maintaining two obese mutant rat strains (WNIN/Ob and WNIN/GR-Ob) in our animal facility since 1997. These rat colonies are perpetuated by crossing heterozygous littermates, since the obese phenotypes of both genders turned out be infertile. The present study revealed the reasons for this infertility. The male obese rats, though appeared normal in terms of sperm count, sperm motility and...

The pattern of vaginal cell exfoliation during the oestrous cycle period was studied in cycling and non-descript West African dwarf (WAD) goats. The exfoliated epithelial cells were categorised into parabasal, intermediate and superficial and their relative occurrences were used to determine the reproductive status of the cycling and non-descript does. The mean cell counts of the epithelial and...

Changes in endogenous prolactin levels in rats with age and after ovariectomy varied according to the reproductive state, emphasizing the different mechanisms underlying infertility in rats in constant oestrus and prolonged dioestrus.

UNLABELLED Our aim was to compare Corpus luteum (CL) development and blood plasma concentration of progesterone ([P4]) in thoroughbred mares after spontaneous ( CONTROL C) or human chorionic gonadotrophin (hCG)-induced ovulation. Lactating mares (C=12; hCG=21) were daily teased and mated during second oestrus post-partum. Treated mares received 2500 IU hCG i.v. at first day of behavioural oes...

OBJECTIVE Production of the appropriate pattern of gonadotrophin levels is crucial to proper functioning of the female reproductive system. We aimed to establish whether the pituitary has invariant secretory characteristics when isolated from in vivo controls. We aimed to obtain information during both the rising and declining phases of the gonadotrophin surge. DESIGN This study investigated ...

A dose determination study for the prostaglandin analogue cloprostenol was conducted in the Red Sokoto Does (RSD). 24 RSD were divided into four groups of 6 animals, the first group is the untreated control receiving 0μg of the cloprostenol. The second, third and fourth groups were given 50μg, 75 μg and 100 μg of the drug respectively. No oestrus response was observed in the control. All the an...