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. 2021 Sep 18;53(5):452.
doi: 10.1007/s11250-021-02928-4.

Feed intake, methane yield, and efficiency of utilization of energy and nitrogen by sheep fed tropical grasses

Eduardo Bohrer de Azevedo  1 , Jean Víctor Savian  2 , Gláucia Azevedo do Amaral  3 , Diego Bitencourt de David  4 , José Ignacio Gere  5 , Marta Moura Kohmann  6 , Carolina Bremm  7 , Felipe Jochims  8 , Angel Sánchez Zubieta  3 , Horacio Leandro Gonda  9 , Cimélio Bayer  10 , Paulo César de Faccio Carvalho  3
Affiliations

Feed intake, methane yield, and efficiency of utilization of energy and nitrogen by sheep fed tropical grasses

Eduardo Bohrer de Azevedo et al. Trop Anim Health Prod. .

Abstract

Forage allowance impacts dry matter (DM) intake and the use of nutrients by ruminants. The efficient use of protein and energy from pasture is related to better livestock performance and lower environmental impacts. The aims of this study were to evaluate the effect of forage allowance levels on intake, digestibility, nitrogen (N) and energy balance, and methane (CH4) emissions by lambs fed fresh pearl millet [Pennisetum americanum (L.) Leeke]. An indoor trial was performed using lambs in a completely randomized design with four treatments [forage allowance at 1.5, 2.0, 2.5 kg DM/100 kg of live weight (LW), and ad libitum allowing 20% of refusals] and four replicates (lambs). Forage intake, digestibility, total urine and feces excretion, and CH4 emission were measured to calculate N and energy balances. An increase in forage allowance resulted in a linear increase in lamb forage intake, N retention, and metabolizable energy intake. Moreover, lamb CH4 emission (g/day) also increased with greater forage allowance, while CH4 yield decreased linearly as forage allowance increased. Our results indicate that maximizing forage intake improves N and energy use efficiency and mitigates CH4 yield and decreases CH4 conversion factor (Ym) by lambs fed pearl millet forage. Thus, management strategies that optimize intake of tropical forages by ruminants improve the use of nutrients ingested and mitigates negative impacts to the environment.

Keywords: Forage allowance; Forage digestibility; Greenhouse gas emissions; Nutrient use; Pearl millet.

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