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Influence of Frequency and Source of Protein Supplementation on Energy Metabolism in Feeder Lambs^{1, 2,}

New Mexico State University, University Park^,4

Abstract

A factorially-designed experiment using 80 crossbred lambs was used to study the growth response (weight gains), carcass data and NE_M+P of the ration as influenced by source of protein, frequency of protein supplementation and sex. There was no significant difference between the protein sources (dehydrated alfalfa and cottonseed meal) in growth response or carcass data. Lambs fed the control rations (no protein supplement) gained significantly less than lambs fed protein supplement. There was no significant difference in weight gain and carcass data for lambs fed rations supplemented with protein at 1-, 7-, 14- or 21-day intervals. Wethers gained significantly more than ewe lambs and utilized the energy of the ration more efficiently. The rations supplemented with cottonseed meal had a greater NE_M+P value than rations supplemented with dehydrated alfalfa; however, there were no significant differences due to frequency of protein supplementation.

¹ Journal Article 250, Agricultural Experiment Station, New Mexico State University, University Park, New Mexico.

² This investigation was partially supported by a grant from American Dehydrators Association and was conducted in cooperation with the Agricultural Research Service, U. S. Department of Agriculture, Ft. Wingate, New Mexico.

³ The authors express their appreciation to Monte Mauldin and Ross Robinson for their valuable technical assistance.

⁴ Department of Animal Science.