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Rumen Microbial Numbers in Lambs as Affected by Level of Feed Intake and Dietary Diethylstilestrol¹

Ohio Agricultural Research and Development Center^,4, Wooster, 44691

Abstract

Eight wether lambs were used to study the possible, changes in rumen microbial numbers associated with feeding the same ration at levels equal to either 1.0 or 1.8 times their daily maintenance energy requirement. Diethylstilbestrol, fed at levels of 0 or 4 mg per animal per day, was also included as a variable. All lambs were subjected to all treatments, using a 4 x 4 latin square, extra period design. Decreases of 11.8% in total numbers of rumen ciliate protozoa, 28.4% in rumen ammonia nitrogen levels and 20.5% in plasma urea nitrogen levels were observed with the 1.8 times maintenance energy intake. In contrast, total viable anaerobic rumen bacterial numbers and growth rate were increased by 19.3 and 83.7%, respectively. None of the above parameters were affected by including DES in the ration.

¹ Approved for publication as Journal Article No. 117-73 by the Associate Director of the Ohio Agricultural Research and Development Center.

² Department of Veterinary Science.

³ Present Address: Department of Animal Science, Eli Lilly & Company, Greenfield, Indiana, 46140.

⁴ Department of Animal Science.