Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Nitrate supplementation of rations based on rice straw but not Pangola hay, improves growth performance in meat goats

  • Paengkoum, Siwaporn (Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University) ;
  • Khotsakdee, Jiravan (Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan) ;
  • Paengkoum, Pramote (School of Animal Technology and Innovation, Suranaree University of Technology) ;
  • Schonewille, Thomas (Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan) ;
  • Yuangklang, Chalermpon (Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan)
  • Received : 2020.04.23
  • Accepted : 2020.07.28
  • Published : 2021.06.01
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Abstract

Objective: Supplemental nitrate is known to be an effective tool to mitigate methane emission by ruminants. Based on theoretical considerations, supplemental nitrate can improve but also deteriorate the growth performance. The overall effect of supplemental nitrate on growth performance, however, is not yet known. The objective of the current study was therefore to evaluate the effect of a higher dose of NO3- on overall growth performance when feeding either Pangola grass hay or rice straw. Methods: Thirty-two crossbred, 3-month-old Thai native×Anglo-Nubian crossbred male goats were used. The experiment had a 2×2 factorial design with an experimental period of 60 days. Eight goats were randomly allocated to each dietary treatment, i.e. a ration containing either Pangola hay (Digitaria eriantha Steud) or rice straw (Oryza Sativa) as a source of roughage, supplemented with a concentrate containing either 3.2% or 4.8% potassium nitrate. The rations were formulated to be isonitrogenous. The animals were weighed at the start of the experiment and at days 30 and 60. Feces were collected during the last five days of each 30-day period. Results: High-nitrate increased overall DM intake by approximately 3%, irrespective the source of roughage, but only the goats fed a rice straw-based ration responded with an increase in body weight (BW). Thus, the overall feed conversion ratio (kg feed/kg BW gain) was influenced by roughage source ×nitrate and decreased by almost 60% when the goats were fed rice straw in combination with a high versus a low dietary nitrate content. The digestibility of macronutrients was only affected by the source of roughage and the digestibility of organic matter, crude protein, and neutral detergent fibre was greater when the goats were fed Pangola hay. Conclusion: It was concluded that the replacement of soybean meal by nitrate improves the growth performance of meat goats fed rations based on rice straw, but not Pangola hay.

Keywords

References

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