Effects of varying ruminally undegradable protein supplementation on forage digestion, nitrogen metabolism, and urea kinetics in Nellore cattle fed low-quality tropical forage

Journal of Animal Science
E D BatistaMario F Paulino

Abstract

Effects of supplemental RDP and RUP on nutrient digestion, N metabolism, urea kinetics, and muscle protein degradation were evaluated in Nellore heifers () consuming low-quality signal grass hay (5% CP and 80% NDF, DM basis). Five ruminally and abomasally cannulated Nellore heifers (248 ± 9 kg) were used in a 5 × 5 Latin square. Treatments were the control (no supplement) and RDP supplementation to meet 100% of the RDP requirement plus RUP provision to supply 0, 50, 100, or 150% of the RUP requirement. Supplemental RDP (casein plus NPN) was ruminally dosed twice daily, and RUP supply (casein) was continuously infused abomasally. Jugular infusion of [NN]-urea with measurement of enrichment in urine was used to evaluate urea kinetics. The ratio of urinary 3-methylhistidine to creatinine was used to estimate skeletal muscle protein degradation. Forage NDF intake (2.48 kg/d) was not affected ( ≥ 0.37) by supplementation, but supplementation did increase ruminal NDF digestion ( < 0.01). Total N intake (by design) and N retention increased ( < 0.001) with supplementation and also linearly increased with RUP provision. Urea entry rate and gastrointestinal entry rate of urea were increased by supplementation ( < 0.001). Supplementation...Continue Reading

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Citations

Feb 24, 2016·Journal of Animal Science and Biotechnology·Luana Marta de Almeida RufinoMário Fonseca Paulino
Nov 2, 2016·Asian-Australasian Journal of Animal Sciences·J F FigueirasS C Valadares Filho
Jun 14, 2017·Journal of Animal Physiology and Animal Nutrition·H M ArelovichH E Laborde
Mar 10, 2016·Asian-Australasian Journal of Animal Sciences·Ísis LazzariniMarcia de Oliveira Franco
Oct 15, 2019·Animal : an International Journal of Animal Bioscience·T R AmorimM I Marcondes
Jan 11, 2017·Animal : an International Journal of Animal Bioscience·E D BatistaR F D Valadares
Mar 25, 2019·Journal of Dairy Science·Meng M LiMark D Hanigan
Jun 12, 2019·Tropical Animal Health and Production·Alyce Raiana Monteiro Dos SantosMilene Rodrigues Dias
Dec 11, 2019·Foods·Felista W MwangiAduli E O Malau-Aduli

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