Rumen-protected lysine and methionine failed to improve the performance of latenursing Awassi ewes regardless of dietary protein contents.

Authors

  • Mofleh S Awawdeh Department of Veterinary Pathology and Public Health, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan. https://orcid.org/0000-0001-8776-3892

Keywords:

Amino acids; lysine; methionine; nitrogen; protein; sheep

Abstract

Objective: The current study investigated the effects of supplying ruminally protected amino acids (AA) (lysine, L; and methionine, M) and dietary protein levels on the performance of late-nursing ewes. Materials and Methods: Thirty-one Awassi ewes nursing single lambs were individually housed and assigned randomly to one of four treatment groups (2 × 2 factorial design). Ewes in treatment groups were (with supplemental RPL and RPM) or were not (without supplemental RPL and RPM) supplemented with lysine (8.5 gm/day) and methionine (4 gm/day) and were fed diets containing either 13.2 (moderate protein) or 11.1% (low protein) protein. Results: No interactions between supplemental AA and dietary protein levels were observed. Supplying ewes with L and M did not affect (p ≥ 0.06) their nutrient intake or their final body weights (BWs). Additionally, milk composition, yield, and efficiency were not affected by supplemental L and M. Decreasing dietary protein levels did not affect (p = 0.13) the final BWs, milk yield, composition, and efficiency but decreased (p < 0.01) nutrient intake of ewes. Conclusion: Under our study conditions, reducing the protein contents of the diets from 13.2% to 11.1% had no negative impact on late-nursing ewes. Regardless of dietary protein level, the beneficial effect of supplying L and M was not evident.

J. Adv. Vet. Anim. Res., 11(3): 711-716, September 2024

http://doi.org/10.5455/javar.2024.k821

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Published

2024-09-29

How to Cite

Awawdeh, M. S. (2024). Rumen-protected lysine and methionine failed to improve the performance of latenursing Awassi ewes regardless of dietary protein contents. Journal of Advanced Veterinary and Animal Research, 11(3), 711–716. Retrieved from https://banglajol.info/index.php/JAVAR/article/view/81051

Issue

Vol. 11 No. 3 (2024)

Section

Original Articles

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Copyright (c) 2024 Mofleh S Awawdeh

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