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Reproductive and Productive Performance of Sheep of Rajshahi, Bangladesh Insight About Effects of Genotype and Parity

Md. Jalal Uddin Sarder
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh

Md. Hamayetul Islam
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh

Mst. Israt Zerin Moni
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh

Syed Sarwar Jahan
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh

Sharmin Aktar
Department. of Microbiology & Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh

Jashim Uddin
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Context: The reproductive and productive parameters of sheep is very important to develop the sheep farming. Objectives: The aim of the present study was to evaluate the reproductive and productive performance (RPP) in relation to genotype and parity of 200 sheep. Materials and Methods: The study was done at Poba and Mohonpur upazila’s of Rajshahi district, Bangladesh during the period from July, 2011 to June, 2012. The RPP were age at puberty (AP), age at first lambing (AFL), gestation length (GL), first heat after lambing (FHAL), birth weight of lamb (BWL), litter size(LS), weaning period (WP) and lambing interval (LI). The data collected from the owners using pre-tested questionnaires. Results: The average values for the AP, AFL, GL, FHAL, BW, LS, WP and LI were found 252±7 days, 398±7 days, 147±.15 days, 16.26±1.45 days, 0.96±.32 kg, 1.85±.02, 95.9±1.7 days and 162±2.43 days, respectively have been studied. Genotype of sheep has divided into two groups on the basic on their genetic composition of ear size viz; Long ear (n=48) and Short ear (n=152). Genotype had significant effect (P<0.05) on FHAL, LS and LI but no effect on AP, AFL, GL, BW and WP. Long ear sheep had shown better performance of RPP than the short ear sheep. The minimum values of AP, AFL, GL, FHAL, BW, WP and LI except LS in Long ear sheep and maximum in Short ear sheep. 1st (n=47), 2nd (n=53), 3rd (n=43) , 4th(n=26), 5th (n=13) and > 6th(n=18) parity of sheep had significant effect (P<0.05) on all the RPP excluding FHAL, WP and LI. Significantly (P<0.05) highest liter size (2.17±0.1) was found in the >5th parity and lowest in 1st parity (1.52±0.4 ). The lowest time required for LI (8.64±2.3) in >6th parity and highest in 1st parity (176.50±23days). Conclusion: It was concluded that the Long ear genotype and >6th parity group had shown excellent RPP under the conventional condition of sheep in Rajshahi region of Bangladesh.

Keywords: Sheep, Reproductive, Productive performance, Genotype, Parity

Location: The Rajshahi University campus, Mohonpur and Paba Upazila of Rajshahi district, Bangladesh

Start Date: 01-07-2011

End Date: 30-06-2012

Program Area: Variety and Species

Commodity: Sheep

Objectives:

To investigate the evaluation the reproductive and productive performance in relation to genotype and parity of sheep at northern region specially Rajshahi Barind area of Bangladesh.

Methodology:

Study Area: The survey was carried out around the Rajshahi University campus, Mohonpur and Paba Upazila of Rajshahi district under in the Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Bangladesh during 1st July, 2011 to 30th June, 2012. Theses regions are based on high sheep population density, large number of farmer’s involvement in sheep rearing as well as good communication. Selection of Experiment Animals: A total of 200 ewes were selected from 29 farmers of said study area. Out of 29 farmers, 16 farmers (n=110 ewes) were at Rajshahi city and 13 farmers were (n=90 ewes) from Mohonpur Upazila. Each farm comprises 2-10 ewes. These sheep were a non-descript type or local breed. The selected ewes were classified according to their genotype and parity. Firstly, ewes were classified according to the genotypic composition on the basis of size and shape of ears and tail such as Short ears (n=152, rudimentary ears and short tail) Long ears (n=48, another type having comparatively long ears and medium tail). The selected ewes again classified into 6 groups on the basis of number of lambing stage such as Group-I: 1st parity (first time lambing, n=47), group II (second times lambing, n=53) group-III (third times lambing, n=43), Group-IV (times lambing, n=26), group-V (five times lambing, n=13) and group-V ( six and above times lambing, n=18). Management of sheep: The sheep management system was not commercial. They kept their buck in low-cost house. The house made of brick or wooden or muddy floor, wall of bamboo and roof of tin or straw. The farmers raise their sheep under scavenging condition without any economic consideration. The farmers keep the flock in an open house or open confined area without tethering during night time. In day time, the flock is usually grazing in field, bank of river, road or bazzar etc. Data collection: The survey schedule was developed according to the objectives of the study. Survey sheet was prepared to collect the desired information from the sheep owner and sheet contains reproductive and productive performance (RPP). Age at puberty (AP) - The age at puberty which a ewe first shows oestrus sign and behavior may be defined as age at puberty. It was measured in days (d) and total number of observation was 200. Age at first lambing (AFL) - It is defined as the age when the ewe gives first lamb in her life. In this study total records for age at first lambing was 200 and it was measured in days (d). Gestation length (GL) - It was calculated that as interval from conceived to parturition. The duration of gestation was expressed in terms of days and total number of observation was 199. First heat after lambing (FHAL) - It is defined that the interval between date of lambing and the date of first shows the oestrus. It was also measured in days (d). Total number of observations was of this trait was also 199. Birth weight of lamb (BWL) - The birth weight of newborn lamb is termed as the birth weight. It was measured in Kilogram (Kg) and total observation of this trait was also 199. Litter size (LS) - How many lambs at a time or per parturition. Total observation was 198. Weaning period (WP) - Age at which a lamb leaves from their mother or when lamb starts to take green grass rather than suckling is called the weaning period. It is recorded in days (d) and total observation was 163. Lambing interval (LI) - It is calculated that interval between one lambing to succeeding lambing. It was also measured as days (d) and total observation was 153. Statistical Analysis: The raw data has been sorted and computed and statistically analyzed to calculate the effect of breed and parity on RPP of ewe. Means±SE has been calculated of reproductive and productive performance of ewes in relation to breed and parity. The obtained information was loaded and stored on the SPPS spreadsheet. Then data were analyzed using SPSS programme. The means were compared by Duncan’s Multiple Range Test (Steel and Torrie, 1980).

Source of Information: Bangladesh livestock journal. 2015. 1: 31-34; ISSN 2409-7691

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Achievement/Findings:

It was concluded that the Long ear breed and >6th parity group had shown excellent reproductive and productive performance under the conventional condition of sheep in Rajshahi region of Bangladesh. Finally, the present investigation was recommended that there is large scope to establish the sheep farm at a small scale at Rajshahi area especially.

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