Non-protein nitrogen utilization by ruminants: effect of supplementation of oxytetracycline in urea rations of lactating cows on the nitrogen fractions in rumen liquor and blood constituents

Sharma, R.S.; Shukla, P.C.

Indian Journal of Animal Sciences 43(8): 683-687


ISSN/ISBN: 0367-8318
Accession: 000146565

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Kankrej cows in 3 groups of 4 were given 10 kg Napier grass daily, pasture hay to appetite and concentrates in which 40% of the N was supplied by urea. The 2 experimental groups were given 150 or 300 mg oxytetracycline daily for 15 weeks and then had the diet without oxytetracycline for 15 weeks more. Jugular vein blood and rumen samples were taken 3 to 4 h after feeding every 2 weeks. Feed samples were incubated with artificial saliva and strained rumen fluid taken in the 10th and 25th weeks of the experiment. Oxytetracycline decreased the rumen protein N and total volatile fatty acids, but did not influence other N fractions of blood or rumen, blood glucose or milk production.