Inhibiting methane production in Brahman cattle by dietary supplementation with a novel compound and the effects on growth
Inhibiting methane production in Brahman cattle by dietary supplementation with a novel compound and the effects on growth
复制标题
DOI：
10.1071/a96119
复制
发表时间：
1997-01-01
影响因子：
--
通讯作者：
Hunter, RA
中科院分区：
文献类型：
--
作者：
McCrabb, GJ;Berger, KT;Hunter, RA
通过3个试验研究了日粮中添加一种新型抗甲烷化合物(AM)对婆罗门牛(Bos Incus)产甲烷和生长的影响。该化合物是溴氯甲烷(BCM)和α-环糊精的化学络合物，添加到饲料中时化学稳定，从而克服了BCM的高度挥发性。在这些试验中，AM化合物作为不同饲料添加剂的混合物添加到牛的体内。在试验1中，利用密闭式呼吸室测定了AM化合物对饲养牛体内产甲烷的影响。在28天内，AM处理组的产甲烷量(0.001+/-2.4mL/m in)低于对照组(205+/-5.2m L/m in)。在试验2中，我们研究了AM处理12周以上对饲喂低品质粗饲料的肉牛生长的影响。AM处理最显著的效果是降低(P<；001)瘤胃液中的自愿粗饲料干物质采食量(DMI)和降低(P<；0.01)乙酸丙酸酯摩尔比(A：P)。AM处理对平均日增重(ADG)(0.22+/-0.01 kg/天)和料重比(F：G)(20.7+/-1.46 kg DMI/kg体重)没有显著影响。在试验3中，我们研究了AM处理10周以上对饲喂中等品质粗饲料的肉牛生长的影响。AM处理降低了(P<；0.05)DMI，低于未添加AM处理的奶牛，而HGP处理对DMI没有显著影响。AM(P<；0.01)和HGP(P<；0.05)处理分别降低了瘤胃液中的A/P比。AM处理对日增重无显著影响，但HGP处理组的日增重显著高于未处理组(0.76+/-0.27vs0.60+/-0.027 kg/d)。F：HGP治疗后G降低(P<；001)。无论是HGP处理的肉牛还是未处理的肉牛，AM处理均能降低日增重(P<0.05)。该化合物使BCM有效的抗甲烷性能在商业条件下得以实现，延长使用10-12周与提高饲喂优质粗饲料的奶牛的饲料转化效率有关。
Three experiments were conducted to determine the effects of dietary supplementation with a novel antimethanogenic compound (AM) on methane production and growth in Brahman (Bos indicus) steers. The compound was a chemical complex of bromochloromethane (BCM) and alpha-cyclodextrin, which is chemically stable when added to feed, thus overcoming the highly volatile nature of BCM. In these experiments the AM compound was administered to steers as a mixture with different feed supplements.In Expt 1 the effect on in vivo methane production of feeding steers the AM compound was determined using a confinement-type respiration chamber. Methane production of AM-treated steers (0+/-2.4 mL/min) was lower (P < 0.001) than that of control steers (205+/-5.2 mL/min) over 28 days.In Expt 2 we determined the effect of AM treatment over 12 weeks on growth of steers fed on a low quality roughage diet. The most marked effect of AM treatment was reduced (P < 001) voluntary roughage dry matter intake (DMI), and reduced (P < 0.01) acetate:propionate molar ratio (A:P) in rumen fluid. Average daily liveweight gain (ADG) (0.22+/-0.01 kg/day) and feed:gain ratio (F:G) (20.7+/-1.46 kg DMI/kg liveweight) were not significantly affected by AM treatment.In Expt 3 we determined the effect of AM treatment over 10 weeks on growth of steers fed on a medium quality roughage diet, in steers that were either treated or not treated with a hormonal growth promotant (HGP; oestadiol 17 beta). AM treatment reduced (P < 0.05) DMI below that of steers not treated with AM, whereas DMI was not significantly affected by HGP treatment. Both AM (P < 0.01) and HGP (P < 0.05) treatments separately reduced A:P ratio in rumen fluid. AM treatment had no significant effect on ADG, whereas ADG of HGP-treated steers was higher (P < 0.05) than that of steers not treated with HGP (0.76+/-0.27 v. 0.60+/-0.027 kg/day). F:G was reduced (P < 001) by HGP treatment. F:G of both HGP-treated steers and those steers not treated with HGP was reduced (P < 0.05) by AM treatment.We conclude that feeding steers with this novel AM. compound enables the potent antimethanogenic properties of BCM to be realised under commercial conditions, and that prolonged use over 10-12 weeks is associated with an improved feed conversion efficiency in steers fed on better quality roughage diets.