title: Effect of dietary supplementation of gallic acid on nitrogen balance, nitrogen excretion pattern and urinary nitrogenous constituents in beef cattle.
abstract: The objective of the trial was to study the effects of dietary supplementation of gallic acid (GA) on nitrogen (N) balance, N excretion pattern and urinary N constituents in beef cattle. In a 4 × 4 Latin square design, four male 30-month-old Simmental cattle (443 ± 22 kg live weight) received four levels of GA (purity ≥ 98.5%), i.e. 0, 5.3, 10.5, 21.1 g/kg DM, added to a basal ration. Each experimental period lasted 17 d, consisting of 12 d adaptation and 5 d sampling. The results showed that supplementation of GA at 5.3, 10.5 or 21.1 g/kg DM did not affect the N balance but regulated the N excretion pattern by increasing the ratio of faecal N/urinary N and decreasing the ratio of urinary urea N/total urinary N in beef cattle fed at maintenance level.
authors: a State Key Laboratory of Animal Nutrition, College of Animal Science and Technology , China Agricultural University , Beijing , China.
authors: Chen
authors: C
authors: Wei
authors: a State Key Laboratory of Animal Nutrition, College of Animal Science and Technology , China Agricultural University , Beijing , China.
authors: Kai
authors: K
authors: Yang
authors: a State Key Laboratory of Animal Nutrition, College of Animal Science and Technology , China Agricultural University , Beijing , China.
authors: Guangyong
authors: G
authors: Zhao
authors: a State Key Laboratory of Animal Nutrition, College of Animal Science and Technology , China Agricultural University , Beijing , China.
authors: Shixin
authors: S
authors: Lin
authors: a State Key Laboratory of Animal Nutrition, College of Animal Science and Technology , China Agricultural University , Beijing , China.
authors: Zhiwei
authors: Z
authors: Xu
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements / Q000032:analysis; D005243:Feces / Q000737:chemistry; D005707:Gallic Acid / Q000008:administration & dosage*; D008297:Male; D009584:Nitrogen / Q000378:metabolism* / Q000652:urine
chemical_list: D005707:Gallic Acid; D009584:Nitrogen
keywords: Gallic acid; beef cattle; nitrogen balance; nitrogen fixation