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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of feed restriction and forage: concentrate ratio on digestibility, methane emission, and energy utilization by goats

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Castro Lima, Ana Rebeca ; Machado da Rocha Fernandes, Marcia Helena ; Molina de Almeida Teixeira, Izabelle Auxiliadora ; Shiraishi Frighetto, Rosa Toyoko ; Ventoso Bompadre, Thiago Francisco ; Biagioli, Bruno ; Meister, Naomi Cristina ; de Resende, Kleber Tomas
Total Authors: 8
Document type: Journal article
Web of Science Citations: 2

This study was carried out to to evaluate how feed restriction and different forage: concentrate ratios affect digestibility, methane emission (using the SF6 technique), and energy utilization of Anglo-Nubian goats. Fifteen (15) dry and non-pregnant Anglo Nubian goats, averaging 30+2.9 kg body weight, were used. The experiment was divided into two trials, the first of which was designed to study the effects of feed restriction (0% or ad libitum; 15% of feed restriction or equivalent to 85% of ad libitum intake; and 40% of feed restriction or equivalent to 60% of ad libitum intake) and the second, to study the effects of forage: concentrate (F:C) ratios (75: 25, 54: 46, and 25: 75) in the diet. The sulfur hexafluoride (SF6) tracer gas method was used to collect and estimate methane (CH4) emissions. Feed restriction level did not affect apparent total tract digestibility of dry matter (DM), organic matter, crude protein, and neutral detergent fiber. Methane emission (g d(-1)) decreased linearly as intake level decreased. However, energy loss in methane proportional to organic matter intake was similar among levels of feed restriction; consequently, dietary metabolizability did not differ among treatments. Methane gas (g d(-1)) as a function of F: C ratio revealed a quadratic response, showing the highest values when animals were fed the 46: 54 F: C ratio diet (18.2 g d(-1)), suggesting that the decrease in absolute CH 4 occurred when the level of concentrate inclusion in the diet surpassed approximately 50%. The results presented herein may be relevant for the ongoing and future efforts towards completion of an IPCC inventory regarding the contribution of goats to the greenhouse gas effects on the planet. (AU)

FAPESP's process: 11/14842-8 - Methane Production in Growing Goats
Grantee:Ana Rebeca Castro Lima
Support type: Scholarships in Brazil - Master
FAPESP's process: 08/58351-5 - Metabolism, nutritional, requirements and carcass traits of growing goats
Grantee:Kléber Tomás de Resende
Support type: Research Projects - Thematic Grants