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Phenotypic Characteristics of Individual Bull Used for Artificial Insemination (ai) Programme in Bangladesh

M. J. U. sarder
Department of Animal Husbandry and Veterinary Science University of Rajshahi, Rajshahi-6205, Bangladesh

Ms. R. Sultana
Department of Animal Husbandry and Veterinary Science University of Rajshahi, Rajshahi-6205, Bangladesh

L. Nahar
Department of Animal Husbandry and Veterinary Science University of Rajshahi, Rajshahi-6205, Bangladesh

M. A. Islam
Department of Animal Husbandry and Veterinary Science University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

The purpose of the present study was to estimate the effect of phenotypic characteristics on the performances of bulls at three AI centres/stations (CCBSDF, Savar, RDCIF, Rajabarihat and District AI centres, Rajshahi). A total 71 bulls were studied for phenotypic parameters, viz., body weight, body condition score, scrotal circumference (SC), libido score and time required between two ejaculates during 1993 to 2002. The information on the phenotypic parameters was obtained by interviewing the semen collectors in respective AI centers, reading the AI bull resister as well as examining and observing the bull during semen collection. The bulls were classified according to genetic composition viz., Group I: 100% Friesian, Group II: 100% Sahiwal, Group III: 75% Friesian x 25% Local, Group IV: 50% Sahiwal x 50% Friesian, Group V: 50% Friesian x 50% Local and Group VI: 100% Local. In general, the average body weight, body condition score, scrotal circumference (SC), libido score and time required between two ejaculates were 572 ± 124 kg, 3.2 ± 0.5 (Score:1-5), 36.3 ± 1.9cm, 3.3 ± 0.6 (Score: 1-5) and 7.1 ± 2.3 minutes, respectively. Individual bull had significant effect on phenotypic characteristics in six genetic groups. The overall better performance of phenotypic parameter was observed in bull Id #: 0065 for Friesian breed, 163 for 100% Sahiwal breed, 7811 for 75% Friesian x 25% Local, 5156 for 50% Sahiwal x 50% Friesian, 8224 for 50% Friesian x 50% Local and 40248 for 100% Local breed. Therefore, phenotypic characteristics has clearly influenced on bull performances of Artificial Insemination (AI) programme in Bangladesh.

Keywords: Phenotypic characteristics, Bull and AI.

Location: Central Cattle Breeding Station and Dairy FarmSavar, Dhaka, Rajshahi Diary and Cattle Improvement Farm (RDCIF), Rajabarihat

Start Date: 00-01-1993

End Date: 00-12-2002

Program Area: Animal Health and Management

Commodity: Bull

Objectives:

To study the influence of individual bull on body weight, condition score, SC, libido score and time lapses between two ejaculates.

Methodology:

The study was conducted at Central Cattle Breeding Station and Dairy Farm (CCBSDF), Savar, Dhaka, Rajshahi Diary and Cattle Improvement Farm (RDCIF), Rajabarihat and District Artificial Insemination Centre (DAIC) Rajshahi during the period from January, 1993 to December, 2002. Seventy one (71) bulls were selected from three AI centres for the present study. All the bulls were directly or indirectly engaged for AI at different AI Sub-centres or points under the District AI centre, Rajshahi. The bulls were divided into 6 group according to their genetic composition such as: Group I: 100% Friesian (F), Group II: 100% Sahiwal (SL), Group III: 75% Friesianx25% Local (LxFxF), Group IV: 50% Sahiwalx50% Friesian (SLxF), Group V: 50% Friesian x 50% Local (LxF) and Group VI: 100% Local (L). Selection of AI bulls was based on dam's performance and individual performance. The following information was considered for final selection of a bull use in artificial insemination. Lactation of dam and grand mother, type and components of dam and sire, type and components of grand father, disease resistance of sire and dam, age at first calving of dam, calving interval of dam, lactation period of dam, age at maturity of dam. All the bulls were kept under identical conditions of management, feeding (seasonal fodder) and watering. The bulls were housed individually in pens with sufficient cross ventilation and protection against summer heat and in an open space for sunbathing in winter. The management system at 3 (three) AI centres was more or less same.The body weight of each bull was recorded monthly using large weighbridge at CCBSDF, Savar, Dhaka. The body weights of bulls were calculated according to the Shaeffer's formula adopted by at RDCIF, Rajabarihat and DAI centre, Rajshahi. In order to record the health condition the lumber vertebral processes of the bulls were used as landmark. The body conditions of the bulls were recorded at one-month interval during study period. The body condition of the bulls was scored into 1 to 5 scale. Measurements of scrotal circumference (in centimeter) were made fortnightly at the area of the largest diameter of the scrotum using a cloth tape as described. The testes were pulled firmly into the lower part of the scrotum by encircling its base with the hand and pulling down on the testes. The scrotal tape was formed into a loop and slipped over the scrotum and pulled up snugly around the greatest diameter of the scrotal contents. The thumbs and fingers were located on the side of the scrotum rather than between the testes to prevent separation of the testes and inaccurate measurement. The results are presented as Mean SD for body weight, body condition score, scrotal circumference, libido score and time required between two ejaculates of 71 bulls among 6 genetic groups of bull. Data were analyzed applying GLM (General Linear Model for factorial experiments) using SPSS (10.1) computer software package (Anonymous 1996). Duncan's New Multiple Range Test was done to make specific treatment comparison for values that were found significant by F-Test according to procedure outlined by Steel and Torrie.

Source of Information: Journal of Bio- Science. Vol. 15, pp: 99-109, 2007

Article Link (Online Journal): J. bio-sci. 15: 99-109, 2007 ISSN 1023-8654 http://www.banglajol.info/index.php/JBS/index

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

So found that the best performance for phenotypic parameters was observed in bull Id #: 0065 for Friesian breed, 163 for 100% Sahiwal breed, 7811 for 75% Friesian x 25% Local, 5156 for 50% Sahiwal x 50% Friesian, 8224 for 50% Friesian x 50% Local and 40248 for 100% Local breed. Bull Id #: 0065, 163, 7811, 5156, 8224 and 40248 had good phenotypic performances as well as 100% Friesian breed had better phenotypic performances. Therefore, it can be concluded that the bulls used in AI programme in Bangladesh were affected by their phenotypic performances.

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