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Effects of Feeding System on Productive and Reproductive Performances of Native Sheep.

N. Sultana
Goat and Sheep Production Research Division, Bangladesh Livestock Research Institute, Savar, Dhaka 1341.

M. N. Hasan
Goat and Sheep Production Research Division, Bangladesh Livestock Research Institute, Savar, Dhaka 1341.

M. Ershaduzzaman
Goat and Sheep Production Research Division, Bangladesh Livestock Research Institute, Savar, Dhaka 1341.

M. A. I. Talukder
Goat and Sheep Production Research Division, Bangladesh Livestock Research Institute, Savar, Dhaka 1341.

Abstract/ Executive Summary:

The experiment was conducted with forty four pre-pubertal stages female lamb of 12.5±2.5 kg live weight and 7.5±0.5 months of age. Animals were equally and randomly allocated into two feeding groups, intensive and semi-intensive feeding system with 22 animals in each group. Under intensive system, animals were fed concentrate mixture (15.0% CP; 11MJ ME/kg DM) at the rate of 1.5% of live weight with adlibitum green grass from May to November and supplied UMS in replace of green grass from December to April. In semi-intensive system, they were grazed for 8 hours and fed concentrate mixture as per intensive group. There were no significant differences (p<0.05) in service per conception, litter size, lambing interval, gestation length, service period, birth weight and weaning weight between intensive and semi-intensive feeding system. Reproductive traits (service per conception, litter size, lambing interval, gestation length, service period) and productive traits (birth weight, pre-weaning growth, weaning weight and milk production) was not affected by feeding system. Conception rate was higher (98.0%) in semi-intensive system than intensive system (83.0%). On the other hand lamb survivability was higher in intensive system than semi-intensive system. It may be concluded that semi-intensive feeding system is better to rear sheep under commercial purpose compare to intensive feeding system.

Keywords: Feeding system, Productive, Reproductive, Native sheep.

Location:

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Animal Health and Management

Commodity: Sheep

Objectives:

To determine the effect of feeding systems on productive and reproductive performances of Bengal sheep.

Methodology:

Forty four pre-pubertal stages female lamb of about average 12.5±2.5 kg live weight and about 7.5±0.5 months of age were randomly selected from BLRI sheep farm. All animals were dewormed (Endex®) and injected with 1.5 ml of AD3 E at the start of the trial. Animals were equally and randomly allocated into intensive and semi-intensive feeding system. Under intensive system, animals were fed concentration (15.0% CP; 11MJ ME/kg DM) at the rate of 1.5% of live weight and were not allowed any grazing. In semi-intensive, in addition to daily grazing 8 hours, animals were fed concentration at the rate of1.5% of live weight. The grazing animals were offered to clean drinking water twice daily, in the morning and afternoon on return from grazing area. After grazing, the ewes were housed during night in a permanent wood floor house. The trial was conducted at May to November 2008. In both feeding system, lambs were kept with their mother for two month. In semi-intensive feeding, after one month lambs were stayed with their mother except grazing time. The entire 44 ewes were mated as per approved plan of breeding at Sheep Farm at BLRI. Reproductive traits viz. service per conception, litter size, lambing interval, gestation and birth weight were recorded. Heat was detected from the physical signs of heat which was confirmed with a treasured buck. Body weight of lambs from all experiment animals were recorded each week. Milk yield were recorded after lambing up to two weeks. Milk production was determined by lamb suckling method. Weekly body weight with all experimental animals. The data analyzed by t-test using Compare Mean Procedure of SPSS (version 9.5) statistical package and conception rate, lamb survivability rate were expressed in percent.

Source of Information: BLRI. Proceedings of the Annual Research Review Workshop 2009-2010, Bangladesh Livestock Research Institute, Savar, Dhaka 1341.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Reproductive and productive traits were not affected by intensive and semi-intensive feeding system. Conception rate was higher in semi-intensive system than intensive system. On the other hand lamb survivability was higher in intensive system than semi-intensive system. It may be concluded that semi-intensive feeding system is better to rear sheep under commercial purpose compare to intensive feeding system. Since this study did not focus on farmer’s condition and economic analysis, further study would be required to assess its net economic returns with farmer’s level.

Knowledge Management: Report/Proceedings