The effects of trypanosomosis on the scrotal circumferences and semen characteristics of Yankasa rams were studied for ninety eight days (14 weeks). Sixteen Yankasa rams aged between 24 to 30 months and weighed between 22 to 25 kg were acclimatized for a period of two months in a clean flyproof house and were adequately fed and given water ad libitum. Of the sixteen rams, twelve that were clini...

Background: Artificial insemination is a valuable tool in genetic improvement programs and widely used breeding technique in farm animals. Semen processing and cryopreservation causes considerable damage to sperm DNA, motility apparatus, plasma membrane, acrosomal cap and thus, reduced fertility. Selenium is an integral part of glutathione peroxidase (GSH-Px), an enzyme which protects cell inte...

Semen production from breeding bulls used in Artificial Insemination (AI) program is of great importance cattle breeding. Good quality semen has positive effect on the fertility cows and heifers. The aim this study was to evaluate assessed as freezing ability Red Chittagong Cattle (RCC) bull with fresh-diluted frozen semen. parameters characteristics included were volume per ejaculate (ml), per...

A study was carried out to evaluate the secondary sexual characteristics of four strains of cocks, comprising of two (2) exotics; Bovan Nera Black (BNB) and Isa Brown (ISB), one (1) improved local strain, Shika Brown (SB) and one (1) unimproved local strain, normal feathered cock (NFC). A total of 64 birds (16 for each strain) at 36, 38, 40 and 42 weeks were used for the study. The result indic...

Male fertility assessment is performed in the context of WHO guidelines. Currently the 5th edition of the WHO guidelines have been published and technicians and clinicians are confronted with a new set of criteria. Apart from coming to grips with these criteria it is accepted/assumed that human fertility is declining? However, both aspects are debatable. The accuracy/consistency of semen evalua...

OBJECTIVE To evaluate sperm concentration, morphology and motility of Brazilian semen donors from 1992 to 2003, in the city of São Paulo. METHODS Retrospective study analyzing 182 donor semen samples from 1992 to 2003. The first and the second donated sample were analyzed for each donor. Donor average age was 30.8 years. Means with standard errors, medians with minimum and maximum values, and...

BACKGROUND Obesity is a strong predictor of fecundity and maternal obesity may well program semen quality during pregnancy, but to our knowledge, no published studies have evaluated this hypothesis. METHODS From a Danish pregnancy cohort established in 1984-87, 347 out of 5109 sons were selected for a follow-up study conducted from February 2005 to January 2006. Semen and blood samples were a...

Different semen assays were employed to determine the post -thaw fitness of buffalo and Sahiwal bull spermatozoa. Semen (two ejaculates) was collected from buffalo and Sahiwal bulls (six each) once a week for three consecutive weeks. Semen was diluted in lactose-fructose-egg yolk glycerol extender, equilibrated at 4 ac for 4 hr and frozen in liquid nitrogen vapors. A highly significant differen...

This study was designed to determine the effect of different osmotic pressures on spermatozoa characteristics for cryopreservation of buffalo bull semen using tris egg yolk extender (TEYE). Semen of Nili-Ravi buffalo bulls (n = 04) housed at Semen Production Unit, Qadirabad, Sahiwal, Pakistan, was collected at weekly interval for 10 weeks. Three solutions of tris-citric acid-fructose with osmot...

The aim of this study was to determine the effect of ewe breed on the reaction time and semencharacteristics in the ram. For this purpose, from the native sheep breeds in Iran, seven Lory rams and fourewes (two Lory and two Ghezel breeds) were selected. Seven rams were individually subjected to 4 weeklytrials in which one of the following two treatments was applied alternately. All of rams were...