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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2011;24(10): 1393-1398.
DOI: https://doi.org/10.5713/ajas.2011.11044    Published online August 24, 2011.
Relationships between Methionine Supply, Nitrogen Retention and Plasma Insulin-like Growth Factor-I in Growing Sheep Nourished by Total Intragastric Infusions
Chong Li, Guangyong Zhao
Four 4-month old CharolaisDorset male sheep (initial liveweight 25.01.1 kg), fitted with rumen and abomasal fistulas and nourished by total intragastric infusions, were used to study the relationships between methionine (Met) supply, nitrogen (N) retention and plasma insulin-like growth factor-I (IGF-I). Four graded levels of Met, i.e. 0 g/16 g N, 1.76 g/16 g N, 3.52 g/16 g N and 7.04 g/16 g N, were infused into abomasums as experimental treatments. The sheep and treatments were allocated in a 43 incomplete Latin square design (Yudon square design). The experiment lasted 3 periods and each period was 10 days. Quadratic correlations were found between Met level (x, g/16 g N) and N retention (y, g/d): y = -0.03x2+0.41x+2.62, r2 = 0.66, n = 12, p = 0.008, and between methionine level (x, g/16 g N) and plasma IGF-I concentration (y, ng/ml): y = 0.80x2-4.53x+190.24, r2 = 0.51, n = 12, p = 0.009. No significant correlation was found between plasma IGF-I (x, ng/ml) and N retention (y, g/d) (p>0.05). It was concluded that Met level had a significant influence on N retention and plasma IGF-I concentration whereas IGF-I might not be an important mediator in the regulation of N metabolism by Met in growing sheep nourished by total intragastric infusions.
Keywords: Methionine; Nitrogen Retention; IGF-I; Sheep

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