Using highly nutritious pastures to mitigate enteric methane emissions from cattle grazing systems in South America

被引:19
|
作者
Dini, Y. [1 ,2 ]
Gere, J. I. [3 ,4 ]
Cajarville, C. [1 ]
Ciganda, Veronica S. [5 ]
机构
[1] Univ Republ, Fac Vet, Dept Nutr Anim, Ruta 1 Km 42-5, San Jose, Uruguay
[2] ANII, Montevideo, Uruguay
[3] Univ Tecnol Nacl, Fac Reg Buenos Aires, UIDI, Medrano 951, Buenos Aires, DF, Argentina
[4] Consejo Nacl Invest Cient & Tecn, Godoy Cruz 2290, Buenos Aires, DF, Argentina
[5] Inst Nacl Invest Agr, Programa Prod & Sustentabilidad Ambiental, Estn Expt La Estanzuela, Ruta 50 Km 11, Colonia, Uruguay
关键词
grazing conditions; pasture quality; SF6 tracer technique; DAIRY-COWS;
D O I
10.1071/AN16803
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Enteric methane (CH4) emissions are directly related to the quantity and type of feed intake. Existing mitigation strategies, for example, the addition of legumes to grass-based diets and increased use of grains, have been thoroughly researched and applied in different production systems. In this paper, we propose a need to expand the capacity to mitigate enteric CH4 emissions in cattle under grazing conditions. The objective of this paper was to contribute to evaluate a mitigation strategy under grazing conditions of using contrasting levels of pasture quality. The study was performed with 20 heifers twice during the year: winter and spring. Each season, the study employed a crossover design with two treatments and two 5-day measurement periods. The treatments were two pastures with different nutritional values, including a pasture with a low quality (70% of neutral detergent fibre, 1% of ether extract, 8% of non-fibre carbohydrates), 9% of crude protein, 35% of dry matter digestibility and a pasture with a high quality (42% neutral detergent fibre, 1.3% ether extract, 24% non-fibre carbohydrates, 21% crude protein and 63% dry matter digestibility). Enteric CH4 emissions were measured with sulfur hexafluoride tracer technique. The dry matter intake (kg/day) was measured indirectly using titanium dioxide as an external marker. CH4 emissions from animals grazing the high-quality pasture were 14% lower expressed as % of gross energy intake, and 11% lower expressed by unit of dry matter intake (g CH4/kg). These results quantitative showed the alternative to mitigate CH4 emissions from grazing bovines exclusively through the improvement of the forage quality offered.
引用
收藏
页码:2329 / 2334
页数:6
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