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Image 72 of Progress report (Kentucky Agricultural Experiment Station) n.176

Part of Kentucky Agricultural Experiment Station

-70. GROWTH AND DEVELOPMENT OF EARLY WEANED LAMBS S. E. Poe, H. A. Glimp, W. P. Deweese, and G. E. Mitchell, Jr. The development of the ruminant stomach has been reported to some degree in l the literature. This study was designed to evaluate three pre-weaning rations for the _ young lamb and the effects of each on growth after weaning. M Procedure Thirty Hampshiresired crossbred single ewe lambs were randomly allotted to the following three treatments at birth; (1) milk only; (2) milk plus concentrate creep; ' , and (3) milk plus roughage creep. All lambs were allowed to nurse from 5 p.m. to 8 a. m. and from 12 noon to 1 p. m. daily. Both creep rations were provided freechoice. Weekly feed consumption and weight gains were measured. Two lambs from each , treatment were slaughtered at 4, 6, 8, 12, and 16 weeks of age. The following ` measurements were taken at slaughter: live weight; ingestafree body weight; volume of submerged reticulo-rumen; and weight of wet tissue from each stomach compart- ment. Samples taken from stomach contents at slaughter were analyzed for pH, volatile _ fatty acids, ammonia, thiamine, and riboflavin. Blood samples were collected every two weeks and daily for one week after weaning and analyzed for plasma glucose, urea, and total protein levels. Results and Discussion A Although the pre-weaning consumption of both creep rations was quite low (200 to 500 gm per lamb), lambs on both diets gained significantly faster than the lambs fed " milk only. However, no pre-weaning treatment significantly affected postweaning gains. Rumen development followed the ingestion of dry feed. Little difference was noted in the rumen development of the lambs fed concentrate creep and roughage creep. V. This can be attributed to the small amounts of pre-weaning creep ingested and the short time the creep was provided. After weaning all lambs were fed the same ration and development followed similar patterns regardless of preweaning treatment. INTAKE AND PERFORMANCE OF YOUNG LAMBS S. E. Poe, G. E. Mitchell, Jr., W. P. Deweese, and P. G. Woolfolk At birth the lamb is essentially a monogasteric animal. After the ingestion of i dry feed the rumen develops along with its microbial population. If the objective of three lamb crops in two years is to be reached, a thorough understanding of this free-choice. Each lamb and each ewe were confined individually to a concrete pen bedded with tobacco stems. Each ewe was fed 1 kg of a conventional pelleted ration twice daily. Procedure 'I\ventyfour twin, blackfaced crossbred lambs were randomly allotted to two ` groups at birth. One group received only milk and the other received milk plus creep freechoice. Each lamb and each ewe was confined individually to a concrete pen bedded with tobacco stems. Each ewe was fed 1 kg of a conventional pelleted ration twice daily.

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