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饲喂含有不同棉酚水平棉籽副产品的圣伊内斯羊的甲烷排放

Methane emission of Santa Inês sheep fed cottonseed by-products containing different levels of gossypol.

作者信息

Lima Paulo de Mello Tavares, Oliveira Pedro Batelli, Campeche Aline, Moreira Guilherme Dias, Paim Tiago do Prado, McManus Concepta, Abdalla Adibe Luiz, Dantas Angela Maria Morais, de Souza Jurandir Rodrigues, Louvandini Helder

机构信息

Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, 70910-900, Brasília, DF, Brazil,

出版信息

Trop Anim Health Prod. 2014 Jan;46(1):285-8. doi: 10.1007/s11250-013-0491-3. Epub 2013 Oct 17.

Abstract

The aim of this study was to evaluate the methane (CH4) emission of Santa Inês sheep fed cottonseed by-products, verifying if the gossypol content of these feedstuffs affects CH4 emission. Twelve late-lactating Santa Inês sheep (44.8 ± 7.5 kg body weight (BW)) were allocated in metabolic cages for an experimental period of 19 days, 14 days for adaptation and 5 days for measuring CH4 emission and dry matter intake (DMI). The animals were divided into four treatments, established in accordance with the cottonseed by-product used in concentrate formulation: Control (CON - no cottonseed by-product), Whole cottonseed (WCS), Cottonseed cake (CSC), and Cottonseed meal (CSM). The free gossypol level of the concentrates were 0, 1,276, 350, and 190 ppm for CON, WCS, CSC, and CSM, respectively. Also, the animals received Cynodon dactylon cv. Coast Cross hay, water, and mineral salt ad libitum. The ether extract content of the diets was balanced between treatments by including soybean oil in concentrates. The technique used to measure the CH4 emission was the sulfur hexafluoride (SF6) tracer technique, and the gas samples collected were quantified by analysis in gas chromatography system. The CH4 emission was evaluated considering the daily emission (g CH4/day); DMI (g CH4/kg DMI); and BW (g CH4/kg BW). No statistical difference was found (P > 0.05) between treatments for DMI and CH4 parameters. In the regression analysis, no significant relation (P > 0.05) between gossypol content and CH4 emission was observed. These results suggest that gossypol does not affect rumen methanogenesis.

摘要

本研究的目的是评估以棉籽副产品为食的圣伊内斯羊的甲烷(CH4)排放量,验证这些饲料的棉酚含量是否会影响CH4排放。将12只处于泌乳后期的圣伊内斯羊(体重44.8±7.5千克)安置在代谢笼中,试验期为19天,其中14天用于适应,5天用于测量CH4排放和干物质摄入量(DMI)。根据精料配方中使用的棉籽副产品,将动物分为四个处理组:对照组(CON - 无棉籽副产品)、全棉籽(WCS)、棉籽饼(CSC)和棉籽粕(CSM)。CON、WCS、CSC和CSM精料的游离棉酚水平分别为0、1276、350和190 ppm。此外,动物可随意采食狗牙根属的海岸杂交干草、水和矿物盐。通过在精料中添加大豆油,使各处理组日粮的乙醚提取物含量保持平衡。测量CH4排放的技术是六氟化硫(SF6)示踪技术,收集的气体样品通过气相色谱系统分析进行定量。根据每日排放量(克CH4/天)、DMI(克CH4/千克DMI)和体重(克CH4/千克体重)评估CH4排放。各处理组在DMI和CH4参数方面未发现统计学差异(P>0.05)。在回归分析中,未观察到棉酚含量与CH4排放之间存在显著关系(P>0.05)。这些结果表明,棉酚不会影响瘤胃甲烷生成。

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