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Effects of dietary nonprotein nitrogen on performance, digestibility, ruminal characteristics, and microbial efficiency in crossbred steers.
J Anim Sci 2008; 86(5):1173-81JA

Abstract

Two trials were conducted to evaluate the effects of dietary NPN levels on animal performance, diet digestibility, ruminal characteristics, and microbial efficiency. Experiment 1 was conducted with 24 Holstein x Nellore crossbred steers (350 +/- 20 kg of BW) distributed in 6 blocks to evaluate intake and digestibility of nutrients and performance. The diets consisted of 70% corn silage and 30% concentrate (DM basis) and were formulated to contain 12.5% CP (DM basis). Treatments consisted of 0, 15.5, 31, and 46.5% of dietary N as NPN. There were no treatment differences in the daily intakes of DM (P = 0.47), OM (P = 0.60), CP (P = 0.24), nonfiber carbohydrates (NFC; P = 0.74), or TDN (P = 0.63); however, NDF intake decreased linearly as NPN increased (P = 0.02). Additionally, no effects of NPN were observed on apparent total tract digestibility of DM (P = 0.50), OM (P = 0.53), NDF (P = 0.63), or NFC (P = 0.44). The apparent total tract digestibility of CP increased linearly (P = 0.01), but ADG (1.14 kg/d) was not influenced (P = 0.96) as NPN increased. In Exp. 2, 4 ruminally and abomasally cannulated steers (300 +/- 55 kg of BW) were fed the same diet used in Exp. 1 to evaluate the effects of NPN levels on intake and digestibility of nutrients, ruminal characteristics, and microbial efficiency. There were no differences in the daily intakes of DM (P = 0.22), OM (P = 0.17), CP (P = 0.31), NDF (P = 0.29), or TDN (P = 0.49). However, NFC intake increased linearly (P = 0.02), and there was a quadratic effect (P = 0.01) on intake of ether extract as NPN increased. Ruminal digestibility of CP increased linearly (P = 0.01) with the increase of dietary NPN. There were no differences (P >or= 0.28) in microbial protein synthesis and microbial efficiency among the treatments. The results of these trials suggest that dietary NPN levels (up to 46.5% of total N) can be fed to crossbred steers receiving corn silage-based diets without affecting their growth performance or ruminal protein synthesis.

Authors+Show Affiliations

Department of Animal Science, Universidade Federal de Viçosa, Viçosa, MG 36571, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18272861

Citation

Chizzotti, F H M., et al. "Effects of Dietary Nonprotein Nitrogen On Performance, Digestibility, Ruminal Characteristics, and Microbial Efficiency in Crossbred Steers." Journal of Animal Science, vol. 86, no. 5, 2008, pp. 1173-81.
Chizzotti FH, Pereira OG, Tedeschi LO, et al. Effects of dietary nonprotein nitrogen on performance, digestibility, ruminal characteristics, and microbial efficiency in crossbred steers. J Anim Sci. 2008;86(5):1173-81.
Chizzotti, F. H., Pereira, O. G., Tedeschi, L. O., Valadares Filho, S. C., Chizzotti, M. L., Leão, M. I., & Pereira, D. H. (2008). Effects of dietary nonprotein nitrogen on performance, digestibility, ruminal characteristics, and microbial efficiency in crossbred steers. Journal of Animal Science, 86(5), pp. 1173-81. doi:10.2527/jas.2006-654.
Chizzotti FH, et al. Effects of Dietary Nonprotein Nitrogen On Performance, Digestibility, Ruminal Characteristics, and Microbial Efficiency in Crossbred Steers. J Anim Sci. 2008;86(5):1173-81. PubMed PMID: 18272861.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of dietary nonprotein nitrogen on performance, digestibility, ruminal characteristics, and microbial efficiency in crossbred steers. AU - Chizzotti,F H M, AU - Pereira,O G, AU - Tedeschi,L O, AU - Valadares Filho,S C, AU - Chizzotti,M L, AU - Leão,M I, AU - Pereira,D H, Y1 - 2008/02/13/ PY - 2008/2/15/pubmed PY - 2008/7/17/medline PY - 2008/2/15/entrez SP - 1173 EP - 81 JF - Journal of animal science JO - J. Anim. Sci. VL - 86 IS - 5 N2 - Two trials were conducted to evaluate the effects of dietary NPN levels on animal performance, diet digestibility, ruminal characteristics, and microbial efficiency. Experiment 1 was conducted with 24 Holstein x Nellore crossbred steers (350 +/- 20 kg of BW) distributed in 6 blocks to evaluate intake and digestibility of nutrients and performance. The diets consisted of 70% corn silage and 30% concentrate (DM basis) and were formulated to contain 12.5% CP (DM basis). Treatments consisted of 0, 15.5, 31, and 46.5% of dietary N as NPN. There were no treatment differences in the daily intakes of DM (P = 0.47), OM (P = 0.60), CP (P = 0.24), nonfiber carbohydrates (NFC; P = 0.74), or TDN (P = 0.63); however, NDF intake decreased linearly as NPN increased (P = 0.02). Additionally, no effects of NPN were observed on apparent total tract digestibility of DM (P = 0.50), OM (P = 0.53), NDF (P = 0.63), or NFC (P = 0.44). The apparent total tract digestibility of CP increased linearly (P = 0.01), but ADG (1.14 kg/d) was not influenced (P = 0.96) as NPN increased. In Exp. 2, 4 ruminally and abomasally cannulated steers (300 +/- 55 kg of BW) were fed the same diet used in Exp. 1 to evaluate the effects of NPN levels on intake and digestibility of nutrients, ruminal characteristics, and microbial efficiency. There were no differences in the daily intakes of DM (P = 0.22), OM (P = 0.17), CP (P = 0.31), NDF (P = 0.29), or TDN (P = 0.49). However, NFC intake increased linearly (P = 0.02), and there was a quadratic effect (P = 0.01) on intake of ether extract as NPN increased. Ruminal digestibility of CP increased linearly (P = 0.01) with the increase of dietary NPN. There were no differences (P >or= 0.28) in microbial protein synthesis and microbial efficiency among the treatments. The results of these trials suggest that dietary NPN levels (up to 46.5% of total N) can be fed to crossbred steers receiving corn silage-based diets without affecting their growth performance or ruminal protein synthesis. SN - 1525-3163 UR - https://www.unboundmedicine.com/medline/citation/18272861/Effects_of_dietary_nonprotein_nitrogen_on_performance_digestibility_ruminal_characteristics_and_microbial_efficiency_in_crossbred_steers_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/jas.2006-654 DB - PRIME DP - Unbound Medicine ER -