6 research outputs found
âRotatinuousâ stocking as a climate-smart grazing management strategy for sheep production
We aimed to evaluate the effect of different grazing management strategies on carcass characteristics traits, meat quality and CH4 intensity and yield of lambs grazing Italian ryegrass pastures in Southern Brazil. A grazing trial was performed (2014 and 2015) in a randomized complete block design with two grazing management targets and four replicates. Treatments were traditional rotational stocking (RT), with pre- and post-grazing sward heights of 25 and 5 cm, respectively, and âRotatinuousâ stocking (RN), with pre- and post-grazing sward heights of 18 and 11 cm, respectively. Castrated crossbred Texel and Polwarth lambs were used. Results indicated that diet cost per kg of dry matter (p = 0.001) and per hectare (p < 0.001) were lower for RN than for RT treatment. Final live weight (p = 0.022) and hot and cold carcass weight (p = 0.006) were greater for the RN treatment. All commercial cuts were greater for RN than for RT treatment. The RN treatment presented greater (p < 0.001) production of carcass, edible food and crude protein. Feed efficiency and feed cost conversion were better for RN than for RT treatment. CH4 intensity per kg of carcass, edible food and crude protein gain were 2.6, 2.7 and 2.1 times lower (p < 0.001) for RN. Moreover, CH4 yield was lower (p = 0.014) for RN than for RT treatment, with an average of 7.6 and 8.3% of the gross energy intake, respectively. We conclude that the âRotatinuousâ stocking results in a greater carcass production, carcass quality and lower diet cost, and CH4 intensity and yield of grazing lambs. Adopting this grazing management strategy could enhance both lamb production and mitigation of CH4 intensity and yield in grazing ecosystems, which could be considered a good example of climate-smart livestock production.Universal-CNPq nÂș 481941/2013-
Suprimento de NitrogĂȘnio para Culturas de VerĂŁo pela Aplicação Antecipada em AzevĂ©m Pastejado por Ovinos
RESUMO Busca-se nos Sistemas Integrados de Produção AgropecuĂĄria (SIPA) maior ciclagem do nitrogĂȘnio (N). Este trabalho objetivou avaliar a adubação antecipada em azevĂ©m pastejado por ovinos no Ăndice de nutrição nitrogenada (INN) das culturas de verĂŁo em SIPA. O estudo foi realizado em um protocolo de longa duração manejado, no perĂodo de inverno, sob dois mĂ©todos de pastoreio, contĂnuo e rotativo, e duas intensidades de pastejo, moderada e baixa, com quatro repetiçÔes. No verĂŁo, a ĂĄrea foi subdividida em dois sistemas de cultivos, soja e rotação soja/milho. A fertilização foi feita na fase pastagem, com 75 kg de N e 60 kg de P2O5 e K2O ha-1. Avaliaram-se a massa de forragem residual (MFR) da pastagem e o rendimento, o teor de N e o INN da fitomassa das culturas de verĂŁo. No milho, houve efeito das intensidades de pastejo para INN, ao contrĂĄrio da soja. NĂŁo houve efeito dos mĂ©todos de pastoreio. A MFR Ă© importante fonte de N para a cultura de verĂŁo subsequente. Menores intensidades de pastejo geraram maiores MFR e INN para a cultura do milho. A adubação antecipada nĂŁo influenciou a soja, pois essa atende parte da sua demanda por N pela fixação biolĂłgica