Effect of air temperature on the abomasal and small ...
|Title||Effect of air temperature on the abomasal and small intestinal digestion of a milk substitute diet given to young calves|
|Author(s)||M. Cockram, T. Rowan|
|Abstract||Twelve Friesian calves with abomasal cannulae were kept in a controlled environment chamber and given a milk substitute in buckets at 12-h intervals. Calves were exposed to air temperatures of 25°C from 4 to 10 days old, 5° from 11 to 14 days old, and 25° at 15 days old. At 9, 10, 11, 14 and 15 days old, the abomasal contents of the calves were sampled at 2-h intervals and the temperature and pH of the abomasal contents were recorded at 40-min intervals for a period of 12 h. Rectal and abomasal temperatures of the calves were lower at 11 than at 10 days old, and were greater at 15 than at 14 days old (P<0.05). In a similar experiment 4 Friesian calves with ileal re-entrant cannulae were exposed to air temperatures of 25° from 5 to 19 days old, 5° from 20 to 26 days old, and 25° at 27 days old. At 18, 19, 20, 26 and 27 days old the ileal contents of the calves were collected and sampled for a period of 12 h. There were no significant effects of air temperatures of 25° and 5° on abomasal digestion (acidity and proteolytic activity of the abomasal contents) and ileal apparent digestibility.|
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