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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1996;9(5): 557-562.
DOI: https://doi.org/10.5713/ajas.1996.557    Published online October 1, 1996.
Influence of dietary protein on the fractionation of selenium in the rumen of sheep
A. B. Serra, S. D. Serra, T. Fujihara
The effects of diets differing in protein content through soybean meal supplementation on ruminal fractionation of selenium(Se) were studied. A 3 횞 3 Latin square design was used with three Japanese Corriedale wethers(45 kg average body weight), three periods, and three dietary treatment. The three dietary treatments were : Diet 1, without soybean meal supplementation (14% crude protein, CP); Diet 2, with 10% soybean meal supplementation(16.5% CP); and Diet 3, with 20% soybean meal supplementation(19% CP). All the diets had a Se supplementation in the form of sodium selenite at 0.2 mg Se/kg dietary DM. The Se supplement and the concentrate mixture were fed only in the morning before the hay was given. Daily feeding schedule for gay was set at 09:00 and 17:00 h. On the final day of collection period, ruminal fluid samples were obtained at 0.5, 2, 6, 12 and 24 h post-feeding starting at 09:00 h. Total ruminal fluid Se was markedly higher(p<0.05) in Diet 3 than those in Diets 1 and 2 at almost all sampling time except at 24 h. The proportion of Se in soluble protein to the total ruminal Se was higher (p<0.05) in Diet 3(40%) followedby Diet 2(28%) and Diet 1(21%). The proportion of free inorganic Se to the total ruminal Se was the reverse, especially after two gours where Diet 1(p<0.05) wass higher than the other diets. Bacterial Se was lower(p<0.05) in Diet 1 than those in Diets 2 and 3 at any sampling time. The highest was observed at 2 h postprandially in all diets with a value of 421, 556, 655 關g/kg bacterial DM for Diet1, 2 and 3, respectively. No differences(p>0.05) were observed on ruminal pH, ammonia and total nolatile fatty acids although increasing protein supplementation tended to decline the ruminal pH and increase ruminal ammonia. This study concludes that increasing dietary protein content by soybean meal supplementation can affect the ruminal Se metabolism.
Keywords: Selenium; Selenite; Ruminal Selenium; Bacterial Selenium; Ruminal Ammonia; Bolatile Fatty Acid

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