Earticle

초록

영어

Diets different in crude protein (CP) and undegraded intake protein (UIP) contents were offered to sheep in a metabolism study to describe their effects on nutrient digestibility and nitrogen (N) metabolism. Six Corriedale sheep (body weight=56.2±2.3 kg) were divided in random within a Latin square design (replicated) to 1 of 3 diets: 1) a low-CP diet (LP; 12.2% CP with 35.1% UIP), 2) high CP with low UIP diet (HPLU; 14.9% CP with 33.7% UIP), and 3) high CP with high UIP diet (HPHU; 15.5% CP with 45.8% UIP). High-protein dried distillers grain and soybean meal were the main CP sources for the adjustment of UIP:DIP in the diets. No significant differences were found in feed consumption and nutrient digestibility; however, a greater proportion of CP was digested in sheep fed the HPLU diet (69.4%; P=0.04). Although N intake was greater in sheep receiving HPLU and HPHU diets, loss of N through fecal or urinary route was not different among sheep, which resulted in the highest (12.7 g/d) and lowest N retention (7.40 g/d) in HPHU- and LP-fed sheep, respectively. In conclusion, although CP or UIP content had marginal effects on feed consumption and whole-tract digestibility of the majority of nutrients, with the increased CP and UIP levels in the diet, the efficiency of N utilization was improved with regard to increased N retention with minimal differences in N excretion, which is important from an economic and environmental standpoint.

목차

ABSTRACT
I. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
1. Animal management and diets
2. Analytical methods
3. Statistical analysis
Ⅲ. RESULTS AND DISCUSSION
ACKNOWLEDGMENTS
COMPETING INTERESTS
Ⅳ. REFERENCES

저자

• 이윤희 [ Youn Hee Lee | 건국대학교 의료생명과학대학 식품생명과학부 대학원생 ]
• 이면 [ Myun Lee | 건국대학교 의료생명과학대학 식품생명과학부 대학원생 ]
• Farhad Ahmadi [ 건국대학교 의료생명과학대학 식품생명과학부 대학원생 ]
• 곽완섭 [ Wan Sup Kwak | 건국대학교 의료생명과학대학 식품생명과학부 교수 ] Corresponding Author

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