EFFECT OF
UN-DEGRADABLE PROTEIN SUPPLEMENTATION ON SEMEN QUALITY OF BUFFALO BULLS UNDER HEAT STRESS CONDITIONS
Shafqat Hussain,
M.M. Siddiqui and G. Habib
Faculty of Animal Husbandry and Veterinary Sciences, NWFP Agricultural
University,
Peshawar
Abstract
A study was conducted to investigate the effect of feeding un-degradable protein
(UDP) supplement on the semen quality of buffalo bulls during hot and humid part
of summer season in Peshawar. Six Nili-Ravi
buffalo bulls maintained at a semen production unit, Peshawar were randomly
divided into two equal groups (control and treatment); Both groups were fed a
basal diet of maize fodder ( 15 Kg/day/bull) and wheat straw (6 Kg/day/bull).
Bulls in the control group received 5 kg /day/head of a commercial concentrate
while the treatment group was fed 3 Kg commercial concentrate and 1 Kg UDP
supplement. Both supplements were iso-nitrogenous and provided 150g nitrogen
/head/day. The diets were fed in a switch over design over two periods. Each
period lasted for 32 days. One-week adaptation period was allowed at the start
of each experimental period. In~sacco protein degradability at 12 hours
incubation for commercial concentrate and UDP supplement was 72.87 and 43.46%,
respectively. Mean ambient temperature, humidity and temperature-humidity-index
were 32.01°C, 66.66% and 84.97, respectively: Semen volume of bulls in the
control and treatment groups did not vary and averaged 6.87 ± 0.41 and 7.41 ±
0.56 mI/collection day with a mean sperm concentration of 1004.5 ± 69.06 and
969.14 ± 77.88 xI06/ml, respectively. Number, of defective sperms (head
abl1ormalities, mid-piece defects, proximal droplet and tail defects) in the
control and treatment groups was not different. Feeding of UDP supplement did
not influence the blood concentrations of calcium, phosphorus, urea al1d
glucose. The absence of UDP effect on semen volume, and quality could be
attributed to low thermal stress, feeding small quantity of UDP and less number
of replicate bulls used in the present study.