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Phenotypic Variation and Repeatability of Semen Characteristics of Bulls

M.N. Hague
Department of Genetics and Animal Breeding, Sylhet Government Veterinary College, Tilagor, Sylhet-3100, Bangladesh

A. B.M. M. Islam
Bangladesh Agricultural University, Mymensingh, Bangladesh

A.K.F.H. Bhuiyan
Bangladesh Agricultural University, Mymensingh, Bangladesh

S. A. Aziz
Department of Genetics and Animal Breeding, Sylhet Government Veterinary College, Tilagor, Sylhet-3100, Bangladesh

M.G. Kibria
BLRI, Savar, Dhaka, Bangladesh

Abstract/ Executive Summary:

A total of 30 animals, belonging to three breeds and crossbreds (Friesian, Local x Friesian end Shahiwal Friesian) were analyzed to study the magnitude of phenotypic variation and the repeatability of semen characteristics for volume of ejaculate, mass movement, forward movement and concentrations of semen. The co-efficient of variations ranges from 13.10 to 46.20% for various semen characteristics. Least square analysis of variance showed that breads had a significant effect on volume of ejaculate IP <0.05), mess movement (P<0.01), forward movement (P<0.05) and concentration (P<0.05) of semen. Pooled repeatability of volume of ejaculate, mesa movement, forward movement and concentration ranges from 0.30 to 0.44, which indicated that TOM number of measurements should be considered for gain in accuracy in selecting the bulls. In semen output, It was concluded that repeatabilities of semen characteristics was moderate. The breeds and crossbreds were found suitable for semen production. The crossbreds are as good as the purebreds for semen quality and output. Among the breed and crossbreds, Local x Friesian was found to be the most suitable. There was large phenotypic variation in semen characteristics in both between and within the breeds.

Keywords: Variation, Semen, Age, Repeatability, Bulls

Location: In Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Bull

Objectives:

To study the magnitude of phenotypic variation and the repeatability of semen characteristics for a volume of ejaculate, mass movement, forward movement and concentrations of semen.

Methodology:

Animals and data used: The information of semen characteristics of 30 bulls was collected on the basis of records maintained at the Central Cattle Breeding Station (CCBS), Sawa, Dhaka during the period from 1984 to 1994. The experimental animals were divided into three .groups according to their genetic composition: Friesian (F), Leta, x Friesian (L X F) and Shahlwal x Friesian (SL x F). The records of volume of ejaculate. mess movement, forward movement and semen concentrations were kept for the experimental animals. The experimental animals were also divided into three age groups: two years, three years and four years for the analysis of breed and age effect. The number of animals in each breed, the number of ejaculates, mass movement, forward movement and concentration measurements for the semen characteristics. Feeding end Managernem of Bulls: Stall-feeding was practiced regularly and concentrate feeds ware given two times a day (morning and evening). Concentrate feeds include chickpea, wheat bran, tin oil cake, rice bran, urea molasses and salt The green grasses like Para, Napier, Maize and Oats and in the form of silage were also supplied on the basis of year-round availability. The bulls were also fed a balanced ration of 50% mixed concentrates hay and supplementation of vitamins and minarets. Bulls were tested for fertility before putting them in breeding herd. The weight of the bulls was recorded every month. Semen was collected loin° a standard artificial vagina from the bulls at an interval of 3 to 4 days. Every day 2 ejaculates were taken. A total of 600 ejaculates, 1200 from each of the three groups) was obtained over a period of 1984 to 1994 to study the variations in semen characteristics. The bull calves after selection were brought up in the farm and trained for semen collection from 18 months of age. Records on date of collection, dates of culling, dates of death etc. wore kept. Semen characteristics. analyzed Following three traits of semen were analyzed: Ejaculate volume: Ejaculate volume was recorded from the graduated collection tube immediately after collection. Motility: Percentage motility (mass movement and forward movement of spermatozoa) was estimated by microscopic examination and was recorded in intervals of 10%. Physical characteristics, volume, sperm concentration and motility (undiluted semen under a phase-contrast microscope) were recorded for every ejaculate. Satisfactory semen was deep-frozen by the horizontal vapour freezing technique in 0.5 mi. French strews and the post-thaw motility was recorded after day storage in liquid nitrogen. Concentration: The score of millions per ml was given to each collection depending on the number of spermatozoa found in a semen sample. Statistical procedure: Mean, variance, standard deviation and coefficient of variation of volume of ejaculate, mass movement, forward movement and concentration were calculated in each breed. Analysis of variances and least significant difference 11.50) for broad and age groups for each trait were calculated in each breed according to the procedure described by Snedecor and Cochran 119801.

Source of Information: Pakistan Journal of Biological Sciences 4 (11): 1418-1420, 2001

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study the pooled repeatability of the components of semen characteristics ranged from 0.30 to 0.44, which indicates that more number of measurements should be considered for gain in accuracy in selecting the bulls. From a present study on semen characteristics, It may be concluded that there was large phenotypic variation and the repeatability of semen characteristics was moderate. Semen of crossbred bulls was found to be of better quality and quantity than that of purebred.

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