Effects of ruminally degradable starch levels on performance, nitrogen balance, and nutrient digestibility in dairy cows fed low corn-based starch diets
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Objective: This trial was performed to examine the effects of ruminally degradable starch (RDS) levels in total mixed ration (TMR) with low corn-based starch on the milk production, whole-tract nutrient digestibility and nitrogen balance in dairy cows. Methods: Eight multiparous Holstein cows (body weight [BW]: 717±63 kg; days in milk [DIM]: 169±29) were assigned to a crossover design with two dietary treatments: a diet containing 62.3% ruminally degradable starch (% of total starch, low RDS) or 72.1% ruminally degradable starch (% of total starch, high RDS). Changes to the ruminally degradable levels were conducted by using either finely ground corn or steam-flaked corn as the starch component. Results: The results showed that dry matter intake, milk yield and composition in dairy cows were not affected by dietary treatments. The concentration of milk urea nitrogen was lower for cows fed high RDS TMR than low RDS TMR. The whole-tract apparent digestibility of neutral detergent fiber, acid detergent fiber and crude protein decreased, and that of starch increased for cows fed high RDS TMR over those fed low RDS TMR, with no dietary effect on the whole-tract apparent digestibility of dry matter and organic matter. The proportion of urinary N excretion in N intake was lower and that of fecal N excretion in N intake was higher for cows fed high RDS TMR than those fed low RDS TMR. The N secretion in milk and the retention of N were not influenced by the dietary treatments. Total purine derivative was similar in cows fed high RDS TMR and low RDS TMR. Consequently, estimated microbial N flow to the duodenum was similar in cows fed high RDS TMR and low RDS TMR. Conclusion: Results of this study show that ruminally degradable starch levels can influence whole-tract nutrient digestibility and nitrogen balance in dairy cows fed low corn-based starch diets, with no influence on performance.
Abstract
Objective: This trial was performed to examine the effects of ruminally degradable starch (RDS) levels in total mixed ration (TMR) with low corn-based starch on the milk production, whole-tract nutrient digestibility and nitrogen balance in dairy cows. Methods: Eight multiparous Holstein cows (body weight [BW]: 717±63 kg; days in milk [DIM]: 169±29) were assigned to a crossover design with two dietary treatments: a diet containing 62.3% ruminally degradable starch (% of total starch, low RDS) or 72.1% ruminally degradable starch (% of total starch, high RDS). Changes to the ruminally degradable levels were conducted by using either finely ground corn or steam-flaked corn as the starch component. Results: The results showed that dry matter intake, milk yield and composition in dairy cows were not affected by dietary treatments. The concentration of milk urea nitrogen was lower for cows fed high RDS TMR than low RDS TMR. The whole-tract apparent digestibility of neutral detergent fiber, acid detergent fiber and crude protein decreased, and that of starch increased for cows fed high RDS TMR over those fed low RDS TMR, with no dietary effect on the whole-tract apparent digestibility of dry matter and organic matter. The proportion of urinary N excretion in N intake was lower and that of fecal N excretion in N intake was higher for cows fed high RDS TMR than those fed low RDS TMR. The N secretion in milk and the retention of N were not influenced by the dietary treatments. Total purine derivative was similar in cows fed high RDS TMR and low RDS TMR. Consequently, estimated microbial N flow to the duodenum was similar in cows fed high RDS TMR and low RDS TMR. Conclusion: Results of this study show that ruminally degradable starch levels can influence whole-tract nutrient digestibility and nitrogen balance in dairy cows fed low corn-based starch diets, with no influence on performance.
참고문헌 (41)
- Godfray HCJ, "The future of the global food system", Philos Trans R Soc Lond, 365, pp.2769~2777 (2010)
- Firkins J, "Effects of grain variability and processing on starch utilization by lactating dairy cattle", J Anim Sci, 79, pp.E218~E238 (2001)
- Krause K, "Effects of forage particle size and grain fermentability in midlactation cows. I. Milk production and diet digestibility", J Dairy Sci, 85, pp.1936~1946 (2002)
- Huntington GB, "Hepatic urea synthesis and site and rate of urea removal from blood of beef steers fed alfalfa hay or a high concentrate diet", Can J Anim Sci, 69, pp.215~223 (1989)
- Ørskov E, "The effect of processing on digestion and utilization of cereals by ruminants", Proc Nutr Soc, 35, pp.245~252 (1976)
- Reynolds CK, "Recent Advances in Animal Nutrition", pp.105~ (1997), Nottingham University Press
- Allen MS, "Effects of diet on short-term regulation of feed intake by lactating dairy cattle", J Dairy Sci, 83, pp.1598~1624 (2000)
- Feeding Standard of Dairy Cattle, "MOA", Ministry of Agriculture, China, ~, pp.NY (2004), T 34-2004
- Yu P, "In situ rumen degradation kinetics of timothy and alfalfa as affected by cultivar and stage of maturity", Can J Anim Sci, 84, pp.255~263 (2004)
- AOAC, "Official Methods of Analysis" (1990), AOAC International
- Van Soest Pv, "Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition", J Dairy Sci, 74, pp.3583~3597 (1991)
- Estimation of microbial protein supply to sheep and cattle based on urinary excretion of purine derivatives-an overview of the technical details, "Chen XB", International Feed Resources Unit, ~ (1992)
- Valadares R, "Effect of replacing alfalfa silage with high moisture corn on ruminal protein synthesis estimated from excretion of total purine derivatives", J Dairy Sci, 82, pp.2686~2696 (1999)
- SAS Institute Inc, "SAS User’s Guide: Statistics. Version 9.2" (2004), SAS Institute Inc
- Krause KM, "Effects of increasing levels of refined cornstarch in the diet of lactating dairy cows on performance and ruminal pH", J Dairy Sci, 86, pp.1341~1353 (2003)
- Miyaji M, "Milk production, nutrient digestibility and nitrogen balance in lactating cows fed total mixed ration silages containing steam-flaked brown rice as substitute for steam-flaked corn, and wet food by-products", Anim Sci J, 84, pp.483~488 (2013)
- Yang WZ, "Effects of barley grain processing on extent of digestion and milk production of lactating cows", J Dairy Sci, 83, pp.554~568 (2000)
- Oba M, "Effects of corn grain conservation method on feeding behavior and productivity of lactating dairy cows at two dietary starch concentrations", J Dairy Sci, 86, pp.174~183 (2003)
- Sheperd A, "Long-term effects of acetate and propionate on voluntary feed intake by midlactation cows", J Dairy Sci, 81, pp.2240~2250 (1998)
- Miyaji M, "Effect of substituting brown rice for corn on lactation and digestion in dairy cows fed diets with a high proportion of grain", J Dairy Sci, 97, pp.952~960 (2014)
- Dhiman T, "Influence of corn processing and frequency of feeding on cow performance", J Dairy Sci, 85, pp.217~226 (2002)
- Burkholder K, "The effect of steam flaked or dry ground corn and supplemental phytic acid on nitrogen partitioning in lactating cows and ammonia emission from manure", J Dairy Sci, 87, pp.2546~2553 (2004)
- Huntington GB, "Starch utilization by ruminants: from basics to the bunk", J Anim Sci, 75, pp.852~867 (1997)
- Yu P, "Effects of ground, steam-flaked, and steam-rolled corn grains on performance of lactating cows", J Dairy Sci, 81, pp.777~783 (1998)
- Sutton JD, "A comparison of starchy and fibrous concentrates for milk production, energy utilization and hay intake by Friesian cows", J Agric Sci, 109, pp.375~386 (1987)
- Hoover W, "Chemical factors involved in ruminal fiber digestion", J Dairy Sci, 69, pp.2755~2766 (1986)
- Smith W, "Factors affecting cellulolysis by Ruminococcus albus", J Bacteriol, 114, pp.729~737 (1973)
- Oliveira J, "Influence of sorghum grain processing on performance of lactating dairy cows", J Dairy Sci, 76, pp.575~581 (1993)
- Zhong RZ, "Effects of substitution of different levels of steam-flaked corn for finely ground corn on lactation and digestion in early lactation dairy cows", J Dairy Sci, 91, pp.3931~3937 (2008)
- Hatew B, "Effects of dietary starch content and rate of fermentation on methane production in lactating dairy cows", J Dairy Sci, 98, pp.486~499 (2015)
- Blaxter K, "The utilization of protein as a source of energy in fattening sheep", Br J Nutr, 16, pp.397~407 (1962)
- Zhou X, "Effect of dietary energy source and level on nutrient digestibility, rumen microbial protein synthesis, and milk performance in lactating dairy cows", J Dairy Sci, 98, pp.7209~7217 (2015)
- Bernard J, "Effect of supplemental l-lysine-HCl and corn source on rumen fermentation and amino acid flow to the small intestine", J Dairy Sci, 87, pp.399~405 (2004)
- Miyaji M, "Effect of replacing corn with brown rice grain in a total mixed ration silage on milk production, ruminal fermentation and nitrogen balance in lactating dairy cows", Anim Sci J, 83, pp.585~593 (2012)
- Ohtani F, "Influence of readily fermentable carbohydrate supplementation to the diet on nitrogen excretion in lactating cows", Nihon Chikusan Gakkaiho, 72, pp.239~246 (2001)
- Lemosquet S, "Glucose metabolism in lactating cows in response to isoenergetic infusions of propionic acid or duodenal glucose", J Dairy Sci, 87, pp.1767~1777 (2004)
- Nocek JE, "Protein and energy as an integrated system. Relationship of ruminal protein and carbohydrate availability to microbial synthesis and milk production", J Dairy Sci, 71, pp.2070~2107 (1988)
- Chibisa G, "Effects of partial replacement of dietary starch from barley or corn with lactose on ruminal function, short-chain fatty acid absorption, nitrogen utilization, and production performance of dairy cows", J Dairy Sci, 98, pp.2627~2640 (2015)
- Beauchemin KA, "Effects of grain source and enzyme additive on site and extent of nutrient digestion in dairy cows", J Dairy Sci, 82, pp.378~390 (1999)
- Clark JH, "Microbial protein synthesis and flows of nitrogen fractions to the duodenum of dairy cows", J Dairy Sci, 75, pp.2304~2323 (1992)
- Cabrita ARJ, "Evaluation of the effects of synchronising the availability of N and energy on rumen function and production responses of dairy cows–a review", Anim Res, 55, pp.1~24 (2006)