Forage management intensification and supplementation strategy: Intake and metabolic parameters on beef cattle production

Autor(es)

Delevatti, Lutti Maneck ^[1] ; Romanzini, Elieder Prates ^[1] ; Werner Koscheck, Jefferson Fabiano ^[2] ; da Ross de Araujo, Tiago Luis ^[1] ; Renesto, Diego Monteira ^[1] ; Ferrari, Adriana Cristina ^[1] ; Barbero, Rondineli Pavezzi ^[3] ; Mulliniks, John Travis ^[4] ; Reis, Ricardo Andrade ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Fac Ciencias Agr & Vet, Dept Zootecnia, Campus Jaboticabal, BR-14884900 Jaboticabal, SP - Brazil

^[2] Trouw Nutr Brasil, BR-78098370 Cuiaba, MT - Brazil

^[3] Univ Fed Rural Rio de Janeiro UFRRJ, Inst Zootecnia, Dept Prod Anim, BR-23897000 Seropedica, RJ - Brazil

^[4] Univ Nebraska, West Cent Res & Extens Ctr, North Platte, NE 69101 - USA

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL FEED SCIENCE AND TECHNOLOGY; v. 247, p. 74-82, JAN 2019.
• Citações Web of Science: 0

Resumo

Improving animal performance on pasture requires grazing management that optimizes forage intake in combination with the appropriate supplementation strategy. The objective was to determine the effects of sward canopy height and level of supplementation on forage intake, digestibility, and ruminal fermentation kinetics of Nellore steers in a double Latin square design with repeated measures. Treatments were three sward heights with differing levels of supplementation and included: (1) short height with high supplementation (SH-HS, 15 cm and 0.6% SW); (2) short height with moderate supplementation (SH-MS, 15 cm and 0.3% BW); (3) moderate height with moderate supplementation (MH-MS, 25 cm and 0.3% BW); (4) moderate height with low supplementation (MH-LS, 25 cm and 0.1% BW); (5) tall height with low supplementation (TH-LS, 35 cm and 0.1% BW); and (6) tall height with no supplementation (TH-WS, 35 cm). Intake of crude protein and total digestible nutrients was greater (P < 0.05) with tall swards and moderate supplementation rates. Nutrient digestibility among treatments did not differ (P >= 0.21), possibly due to the availability of high-quality forage during the wet season. Likewise, rate of neutral detergent fiber degradability did not differ (P >= 0.19) among treatments. Ruminal ammonia nitrogen differed (P = 0.02) among treatments with moderate supplementation having the greatest (SH-MS) and lowest (MH-MS) concentrations (13.6 and 9.7 mg/dL, respectively). Ruminal pH and volatile fatty acid concentrations did not differ (P > 0.18) among treatments. Microbial N flow to the small intestine and efficiency of microbial synthesis exhibited a quadratic response with moderate sward height treatments having greater values. With these treatments and under the conditions of this study, various combinations of sward height and supplementation level did not alter rumen fermentation kinetics. (AU)

• Processo FAPESP: 13/25202-5 - Efeito da dieta e da espécie forrageira no perfil metabólico em ruminantes
• Beneficiário: Rondineli Pavezzi Barbero
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 12/20264-0 - Impactos produtivos, ambientais e econômicos de estratégias de suplementação da dieta de bovinos de corte sob alturas de pastejo e estratégias de terminação
• Beneficiário: Ricardo Andrade Reis
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/05894-0 - Intensificação do manejo do pasto e uso da suplementação nos parâmetros produtivos, ambientais e econômicos na recria e terminação de bovinos de corte
• Beneficiário: Jefferson Fabiano Werner Koscheck
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/21138-3 - Parâmetros nutricionais e metabólicos da associação de intensidades de pastejo com doses de suplemento na recria de tourinhos Nelore
• Beneficiário: Lutti Maneck Delevatti
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/14956-6 - Impactos produtivos, ambientais e econômicos de estratégias de suplementação da dieta de bovinos de corte sob alturas de pastejo e estratégias de terminação
• Beneficiário: Rondineli Pavezzi Barbero
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/09394-1 - Eficiência nutricional da dieta de novilhos de corte mantidos em pastagens de diferentes alturas associada a suplementação
• Beneficiário: Tiago Luís da Ros de Araújo
• Modalidade de apoio: Bolsas no Brasil - Mestrado