Low doses of monensin for lambs fed diets containing high level of ground flint corn
Polizel, Daniel Montanher; Martins, André Storti; Miszura, Alexandre Arantes; Ferraz Júnior, Marcos Vinícius de Castro; Bertoloni, Analisa Vasques; Oliveira, Gabriela Bagio; Barroso, José Paulo Roman; Ferreira, Evandro Maia; Pires, Alexandre Vaz.
Sci. agric.;
78(4): 1-8, 2021. tab
Artigo
em Inglês
| VETINDEX
| ID: vti-31168
Resumo
Two experiments were proposed to evaluate the addition of monensin for lambs fed diets containing a high level of mature ground flint corn. The experimental diets were as follows: no inclusion of monensin (M0) and inclusion of 8 (M8), 16 (M16) and 24 mg kg-¹ of monensin (M24). In experiment 1, eight cannulated wethers were divided into a double 4 × 4 Latin square experimental design to evaluate nutrient digestibility, plasma parameters and rumen fermentation. The experiment lasted 112 days, divided into four periods of 28 days each. In experiment 2, ninety-two lambs were used in a randomized block design to evaluate the performance over 56 days. In experiment 1, doses of monensin had no effect on nutrient intake (p >= 0.07) and digestibility (p >= 0.09). There was a quadratic effect for acetate molar proportion (p = 0.01), acetate to propionate ratio (p = 0.04) and rumen pH (p < 0.01). However, there was no effect on the molar proportion of propionate and butyrate. The monensin decreased linearly the total SCFA concentration (p < 0.01). The inclusion of monensin increased glucose (p < 0.01) and decreased lactate concentration in plasma (p = 0.05). In experiment 2, monensin decreased dry matter intake (p = 0.04). However, there was a quadratic effect for average daily gain (p = 0.03) and feed efficiency (p < 0.01), with the greatest values observed for the M8 diet. Thus, the inclusion of 8 mg kg-¹ of dry matter diet (DM) improves ruminal fermentation and plasma parameters, resulting in greater growth performance in lambs.(AU)
Biblioteca responsável:
BR68.1
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