饲粮非纤维性碳水化合物(NFC)与中性洗涤纤维(NDF)比例对育成期杜寒杂交母羊生长性能、营养物质消化率和甲烷产量的影响

doi:10.11843/j.issn.0366-6964.2018.07.009

Abstract

Abstract:

The aim of this study was to investigate the effects of ratios of dietary non-fibrous carbohydrate to neutral detergent fiber(NFC/NDF) on the growth performance, nutrient digestibility and methane(CH₄) production of Dorper×Thin-tailed Han crossbred ewes with 48.0-55 kg of body weight(BW). Thirty ewes with(48.0±0.5) kg BW were selected and divided into 3 treatments with 10 sheep in each treatment:NFC/NDF=0.78(concentrate/forage=35:65, ad libitum), NFC/NDF=1.03(concentrate/forage=50:50, feed restriction) and NFC/NDF=2.17(concentrate/forage=65:35, feed restriction). The trial lasted for 32 d, including a 17-d adaptation and a 15-d experimental period. The energy and crude protein intake were same in each treatment. The average daily weight gain of the treatment of NFC/NDF=0.78 was taken as the standard for the feed restriction of the treatment of NFC/NDF=1.03 and 2.17. The BW was measured before morning feed, and feed intake was recorded daily. The CH₄ production, dietary energy and nutrient digestibility were determined during experimental period. The results showed that:1)The feed conversion efficiency in the NFC/NDF=2.17 treatment was significantly higher than that in the NFC/NDF=0.78 treatment(P<0.05), whereas no significant difference was observed between NFC/NDF=1.03 treatment and other two treatments(P >0.05). 2) The apparent digestibility of dry matter, organic matter, gross energy and metabolic rate of gross energy in NFC/NDF=2.17 treatment were the highest among the 3 treatments(P<0.05). The apparent digestibility of crude protein in NFC/NDF=2.17 treatment was higher than that in NFC/NDF=0.78 treatment(P<0.05), however, there was no significant difference between NFC/NDF=2.17 and NFC/NDF=1.03 treatments, or between NFC/NDF=0.78 and NFC/NDF=1.03 treatments(P>0.05). With the increase of ratio of dietary NFC/NDF, the apparent digestibility of NDF in NFC/NDF=2.17 treatment was the highest(P<0.05), whereas no significant difference was observed between NFC/NDF=0.78 and NFC/NDF=1.03 treatments(P>0.05). 3) The CH₄ emissions in NFC/NDF=2.17 treatment was 32.53 L·d^-1, which was significantly lower than that in NFC/NDF=0.78(58.03 L·d^-1) and NFC/NDF=1.03(63.17 L·d^-1) treatments(P<0.05), whereas no significant difference was observed between NFC/NDF=0.78 and NFC/NDF=1.03 treatments(P>0.05). The similar results were found in CH₄ emission as a proportion of metabolic weight in the 3 treatments. With the increase of dietary NFC/NDF, the CH₄ emission as a proportion of dry matter intake, organic matter intake and digestible organic matter intake in NFC/NDF=2.17 treatment was significantly lower than that in NFC/NDF=1.03 treatment(P<0.05), whereas no significant difference were observed between NFC/NDF=0.78 and other two treatments(P>0.05). The CH₄ emission as a proportion of gross energy intake, digestible energy intake, metabolic energy intake had the similar results. The CH₄ emission as a proportion of NDF intake and digestible NDF intake in NFC/NDF=1.03 treatment was significantly higher than that in the other two treatments(P<0.05), whereas no significant difference was observed between NFC/NDF=0.78 and NFC/NDF=2.17 treatments(P>0.05). The CH₄ emission as a proportion of average daily gain and digestible ADF intake were similar among the 3 treatments(P>0.05). According to the production performance, nutrient digestibility, energy utilization and CH₄ production, it will be recommended that NFC/NDF=2.17 under restriction feeding would achieve the best carbon-cutting results for Dorper×Thin-tailed Han crossbred ewes with 48-55 kg of BW.

CLC Number:

S826.5

ZHOU Yan, DIAO Qi-yu, DONG Li-feng, DENG Kai-dong, XU Gui-shan, MA Tao. The Effect of Different Ratios of Dietary Non-fibrous Carbohydrate (NFC) to Neutral Detergent Fiber (NDF) on Production Performance, Nutrient Digestibility and Methane Emissions of Dorper×Thin-tailed Han Crossbred Growing Ewes[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2018, 49(7): 1405-1415.

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The Effect of Different Ratios of Dietary Non-fibrous Carbohydrate (NFC) to Neutral Detergent Fiber (NDF) on Production Performance, Nutrient Digestibility and Methane Emissions of Dorper×Thin-tailed Han Crossbred Growing Ewes

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