Influence of different levels of concentrate and ruminally undegraded protein on digestive variables in beef heifers1
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AOAC, 1990, Official Methods of Analysis., 15th ed
2006, Effect of urinary collection days, concentrate levels and protein sources on creatinine, urea and purine derivatives excretions and microbial protein synthesis in Nellore cattle, Rev. Bras. Zootec., 35, 870
1990, Energy contributions of volatile fatty acids from the gastrointestinal tract in various species, Physiol. Rev., 70, 567, 10.1152/physrev.1990.70.2.567
1994, Nonstructural carbohydrate and undegradable protein sources in the diet: growth responses of dairy heifers, J. Dairy Sci., 77, 2595, 10.3168/jds.S0022-0302(94)77200-3
1991, Effects of dietary energy level and protein source on nutrient digestion and ruminal nitrogen metabolism in steers, J. Anim. Sci., 69, 2230, 10.2527/1991.6952230x
1990, Effect of energy level and feeding frequency on site of digestion and postruminal nutrient flows in steers, J. Dairy Sci., 73, 2470, 10.3168/jds.S0022-0302(90)78932-1
1990, Composition of ruminal bacteria harvested from steers as influenced by dietary energy level, feeding frequency, and isolation techniques, J. Dairy Sci., 73, 2480, 10.3168/jds.S0022-0302(90)78933-3
1992, Effect of feeding frequency on diurnal variation in plasma and urinary purine derivatives in steers, Anim. Prod., 55, 185, 10.1017/S0003356100037442
1995, Evaluation of the use of the purine derivative:creatinine ratio in spot urine and plasma samples as an index of microbial protein supply in ruminants: Studies in sheep, J. Agric. Sci., 125, 137, 10.1017/S002185960007458X
2003, Research on urinary excretion of purine derivatives on ruminants: Past, present and future.
2008, Determination of creatinine excretion and evaluation of spot urine sampling in Holstein cattle, Livest. Sci., 113, 218, 10.1016/j.livsci.2007.03.013
1992, Microbial protein synthesis and flows of nitrogen fractions to the duodenum of dairy cows, J. Dairy Sci., 75, 2304, 10.3168/jds.S0022-0302(92)77992-2
2000, Effects of protein concentration and degradability on performance, ruminal fermentation, and nitrogen metabolism in rapidly growing heifers fed high concentrate diets from 100 to 230 kg body weight, J. Anim. Sci., 78, 1667, 10.2527/2000.7861667x
2006, Integration of ruminal metabolism in dairy cattle, J. Dairy Sci., 89, E31, 10.3168/jds.S0022-0302(06)72362-1
1994, Mammary and renal excretion of purine metabolites in relation to energy intake and milk yield in dairy cows, J. Dairy Sci., 77, 2376, 10.3168/jds.S0022-0302(94)77180-0
2004, A Comparison of purine derivates excretion with conventional methods as indices of microbial yield in dairy cows, J. Dairy Sci., 87, 2211, 10.3168/jds.S0022-0302(04)70041-7
1993, Diurnal variation of rumen ammonia, serum urea, and milk urea in dairy cows at high and low yields, J. Dairy Sci., 76, 475, 10.3168/jds.S0022-0302(93)77368-3
2000, Calculation of non-structural carbohydrate content of feeds that contain non-protein nitrogen, Page A-25 in Bulletin 339.
1991, Balancing carbohydrates and protein for optimum rumen microbial yield, J. Dairy Sci., 74, 3630, 10.3168/jds.S0022-0302(91)78553-6
2002, Intake and total and partial apparent digestibility of nutrients in steers fed with diets containing several levels of concentrate, Rev. Bras. Zootec., 31, 1543
1985, Urea, Pages 444–453 in Methods of Enzymatic Analysis., 3rd ed
2000, Design of Experiments: Statistical Principles of Research Design and Analysis., 2nd ed
1955, A comparison of titanic oxide and chromic oxide as index materials for determining apparent digestibility, J. Nutr., 56, 265, 10.1093/jn/56.2.265
2006, Effects of dairy cow diet forage proportion on duodenal nutrient supply end urinary purine derivative excretion, J. Dairy Sci., 89, 3552, 10.3168/jds.S0022-0302(06)72395-5
2004, Technical Note: A procedure for the preparation and quantitative analysis of samples for titanium dioxide, J. Anim. Sci., 82, 179, 10.2527/2004.821179x
1996, Effect of fasting on the urinary excretion of nitrogen and purine derivatives by zebu (Bos indicus) and crossbred (Bos indicus × Bos taurus) cattle, J. Appl. Anim. Res., 10, 39, 10.1080/09712119.1996.9706129
2007, Intake and total and partial digestibility of nutrients, ruminal pH and ammonia concentration and microbial efficiency in beef cattle fed with diets containing sorghum (Sorghum bicolor (L.) Moench) silage and concentrate in different ratios, Livest. Sci., 107, 53, 10.1016/j.livsci.2006.09.002
1988, Effect of amount and length of alfalfa hay in diets containing barley or corn on site of digestion and rumen microbial protein synthesis in dairy cows, Can. J. Anim. Sci., 68, 445, 10.4141/cjas88-050
1992, A net carbohydrate and protein system for evaluating cattle diets: II. Carbohydrate and protein availability, J. Anim. Sci., 70, 3562, 10.2527/1992.70113562x
1979, Methods for determining and factors affecting rumen microbial protein synthesis: A review, J. Anim. Sci., 49, 1590, 10.2527/jas1979.4961590x
1996, A review on environmental impacts of nutritional strategies in ruminants, J. Anim. Sci., 74, 3112, 10.2527/1996.74123112x
2007, Urinary purine derivatives excretion as an indicator of in vivo microbial N flow in cattle: A review, Livest. Sci., 111, 181, 10.1016/j.livsci.2007.05.010
2001, Evaluation of titanium dioxide as a digestibility marker for cattle, J. Anim. Sci., 79, 1059, 10.2527/2001.7941059x
1985, Determination of assay parameters for RNA analysis in bacterial and duodenal samples by spectrophotometry. Influence of sample treatment and preservation, Reprod. Nutr. Dev., 25, 1037, 10.1051/rnd:19850804
1999, Effect of replacing alfalfa silage with high moisture corn on ruminal protein synthesis estimated from excretion of total purine derivatives, J. Dairy Sci., 82, 2686, 10.3168/jds.S0022-0302(99)75525-6
1994, Nutritional Ecology of the Ruminant.
1991, Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition, J. Dairy Sci., 74, 3583, 10.3168/jds.S0022-0302(91)78551-2
2007, Increasing crude protein levels in diets of Nellore cattle: Intake and ruminal total tract digestibility, microbial protein synthesis, and ruminal metabolism, Rev. Bras. Zootec., 36, 1199
1962, The determination of chromic oxide in faeces samples by atomic absorption spectrophotometry, J. Agric. Sci., 59, 381, 10.1017/S002185960001546X