The effect of grazing intensity and supplementation on performance, stress indicators and metabolic profiles of finishing lambs

Autor(es)

Ramos Costa, Joao Paulo ; da Silva, Wilton Ladeira ; de Paula, Gregory Caputti ; Tsuzukibashi, Denise ; Malheiros, Euclides Braga ; Ruggieri, Ana Claudia ; Negrao, Joao Alberto

• Tipo de documento: Artigo Científico
• Fonte: SEMINA-CIENCIAS AGRARIAS; v. 36, n. 6, p. 3863-3875, 2015.
• Citações Web of Science: 0

Resumo

In the present study, the effect of grazing intensity (GI) and feed supplementation in sixty-four crossbred Santa Ines lambs was assessed based on performance, blood stress indicators, and metabolic profiles. The GIs analyzed were VH = very high, H = high, L = low, and VL = very low, and were represented by the residual leaf area index (LAIr). The lambs were divided into two groups, supplemented (SP) and non-supplemented (NSP). The dry matter intake (DMI) and average daily gain (ADG) increased linearly with decreasing GI (P < 0.05), and the ADG was higher for the NSP group than the SP group (P < 0.05). The plasma cortisol concentration was higher in the NSP group (P < 0.05), and it was not affected by GIs (P > 0.05). The neutrophil: lymphocyte (N:L) ratio decreased linearly with GI (P < 0.05), and the SP group had a higher N: L ratio (P < 0.05). None of the parameters evaluated for protein metabolism were affected by GI (P > 0.05), except albumin, where the SP group had a higher concentration of this metabolite (P < 0.05). Regarding energy metabolism indicators, glucose showed a linear increase with a decrease in GI (P < 0.05) and was higher in the SP group (P < 0.05); however, there was a decreasing linear effect (P < 0.05) and the NSP group had higher serum levels (P < 0.05) of non-esterified fatty acids (NEFA). The concentration of beta hydroxybutyrate (HBA-B) was higher in the SP group (P < 0.05). The concentration of calcium was affected by GI (P < 0.05). The phosphorus concentration was higher in the SP group (P < 0.05), and concentration of magnesium was not affected by any of the treatments (P > 0.05). It was concluded that GI and SP modified the performance, stress indicators, and metabolic profiles of finishing lambs. (AU)

• Processo FAPESP: 10/14309-5 - Terminação de cordeiros em pastagem de Tifton-85 submetidas a intensidades de pastejo em lotação intermitente
• Beneficiário: João Paulo Ramos Costa
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 10/09924-2 - Avaliação do sistema de terminação de ovinos em pastos de capim-tifton-85 submetidos a intensidades de pastejo rotativo
• Beneficiário: Ana Cláudia Ruggieri
• Modalidade de apoio: Auxílio à Pesquisa - Regular