Global Advanced Research Journal of Agricultural Science (GARJAS) ISSN: 2315-5094
April 2016 Vol. 5(4): pp. 126-131
Copyright © 2016 Global Advanced Research Journals
Full Length Research Paper
Effects of intake restriction and realimentation on diet digestion and ruminal fermentation by growing lambs
Mohamed Abouheif1*, Hussain Al-Sornokh1, Ayman Swelum1,2, Tarek Shafey1 Ahmed Mahmoud3, Faisal Alshamiry1 and Raafat Haroon1
1Department of Animal production, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia.
2Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, 44519, Egypt.
3Zoology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Accepted 11 April, 2016
A total of 15 lambs weighing 41.6±1.34 kg were used in this experiment to determine the effects of intake restriction and realimentation on nutrient digestibility and ruminal fluid characteristics. During the preliminary and first collection periods, lambs were assigned randomly to one of the three treatments, viz. ad libitum intake, 0.90 and 0.80 of ad libitum intake. During the second collection period (realimentation period), all lambs were fed ad libitum. Total tract digestibility of DM, NDF and ADF were not affected by restriction level, whereas digestion of CP increased (P<0.01) for the restricted lambs compared with ad libitum. During restriction, fecal N excretion by the 0.80 ad libitum was lesser (P<0.01) than ad libitum lambs. Urinary N excretion was similar between ad libitum and the restricted fed lambs. Ruminal pH and ammonia N were similar for both restricting intakes at 2h and 4h post feeding compared with ad libitum intake. Total concentration of VFA was lower (P<0.01) for 0.80 ad libitum than for ad libitum at 2 and 4h postfeeding. In realimentation period, no effect was observed in relation to previous feed restriction on pH, ammonia-N and VFA concentrations. The results concluded that a 10 or 20% intake restriction followed by realimentation lead to improvements in ADG and these changes could not be attributed to changes in digestibility or ruminal characteristics.
Keywords: limit-feeding, Realimentation, Digestibility, Nitrogen balance.
- Mohamed Abouheif on Google Scholar
- Mohamed Abouheif on Pubmed
- Hussain Al-Sornokh on Google Scholar
- Hussain Al-Sornokh on Pubmed
- Ayman Swelum on Google Scholar
- Ayman Swelum on Pubmed
- Tarek Shafey Ahmed Mahmoud on Google Scholar
- Tarek Shafey Ahmed Mahmoud on Pubmed
- Faisal Alshamiry on Google Scholar
- Faisal Alshamiry on Pubmed
- Raafat Haroon on Google Scholar
- Raafat Haroon on Pubmed