Influence of sugary-Brawn2 or dent corn at two forage levels on intake, digestion, and milk production by dairy cows
Willcox, M.
Influence of sugary-Brawn2 or dent corn at two forage levels on intake, digestion, and milk production by dairy cows - 1994 - Printed
Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0021-8812 references US (DNAL 49 J82)
Sugary-Brawn2 (su-Bn2) corn endosperm contains higher concentrations of watersoluble polysaccharides than dent corn. Eight multiparous Holstein cows averaging 48 d in milk and 667 kg BW at trial initiation were in a replicated 4 X 4 Latin square design with 28-d periods. Only cows in one square were ruminally cannulated. Treatments were su-Bn2 or dent corn and 45 or 60% of ration DM as alfalfa silage arranged as a 2 X 2 factorial within each square. Diets, formulated to contain 19% CP, were fed as total mixed rations twice daily. Intake of DM and milk yield averaged 26.8 and 39.9 kg/d, respectively, and were not affected by treatment (P > 0.10). Sugary-Brawn2 corn decreased milkfat percentage (3.27 vs 3.45%), particularly for the low-forage diet (3.15 vs 3.40%). Milk protein percentage was higher (3.15 vs 3.10%) for low-forage diets but was not affected (P > 0.10) by corn type. Ruminal pH was lower for low-forage diets. Feeding su-Bn2 corn decreased ruminal pH only at 4 h after feeding. Total VFA in ruminal fluid (millimolar) 6 h after feeding were higher, whereas acetate molar percentage and acetate:propionate ratio were lower for su-Bn2 corn. Ruminal in situ evaluation of su-Bn2 and dent corn revealed a larger soluble fraction, a faster rate of degradation, and higher availabilities of both DM and starch for su-Bn2 corn. Ruminal in situ rate of degradation and AV: of alfalfa hay DM were reduced by su-Bn2 corn. Total tract apparent digestibilities of DM, CP, and starch were greater for su-Bn2 diets. Digestion of a high-alfalfa silage diet was not improved by feeding corn with greater ruminal AV:. Because su-Bn2 corn adversely affected ruminal forage digestion and milkfat percentage and provided no increase in milk yield, it is not recommended as the sole grain source for lactating dairy cows
English
0021-8812
Animal feeding
Animal husbandry
Animal physiology Nutrition
Animal production
Artiodactyla
Behaviour
Bovidae
Bovinae
Cattle
Cereals
Cows
Dairy cattle
Domestic animals
Feeding habits
Livestock
Mammals
Physiological functions
Plant products
Production
Ruminants
Secretion
Useful animals
95-038144
Influence of sugary-Brawn2 or dent corn at two forage levels on intake, digestion, and milk production by dairy cows - 1994 - Printed
Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0021-8812 references US (DNAL 49 J82)
Sugary-Brawn2 (su-Bn2) corn endosperm contains higher concentrations of watersoluble polysaccharides than dent corn. Eight multiparous Holstein cows averaging 48 d in milk and 667 kg BW at trial initiation were in a replicated 4 X 4 Latin square design with 28-d periods. Only cows in one square were ruminally cannulated. Treatments were su-Bn2 or dent corn and 45 or 60% of ration DM as alfalfa silage arranged as a 2 X 2 factorial within each square. Diets, formulated to contain 19% CP, were fed as total mixed rations twice daily. Intake of DM and milk yield averaged 26.8 and 39.9 kg/d, respectively, and were not affected by treatment (P > 0.10). Sugary-Brawn2 corn decreased milkfat percentage (3.27 vs 3.45%), particularly for the low-forage diet (3.15 vs 3.40%). Milk protein percentage was higher (3.15 vs 3.10%) for low-forage diets but was not affected (P > 0.10) by corn type. Ruminal pH was lower for low-forage diets. Feeding su-Bn2 corn decreased ruminal pH only at 4 h after feeding. Total VFA in ruminal fluid (millimolar) 6 h after feeding were higher, whereas acetate molar percentage and acetate:propionate ratio were lower for su-Bn2 corn. Ruminal in situ evaluation of su-Bn2 and dent corn revealed a larger soluble fraction, a faster rate of degradation, and higher availabilities of both DM and starch for su-Bn2 corn. Ruminal in situ rate of degradation and AV: of alfalfa hay DM were reduced by su-Bn2 corn. Total tract apparent digestibilities of DM, CP, and starch were greater for su-Bn2 diets. Digestion of a high-alfalfa silage diet was not improved by feeding corn with greater ruminal AV:. Because su-Bn2 corn adversely affected ruminal forage digestion and milkfat percentage and provided no increase in milk yield, it is not recommended as the sole grain source for lactating dairy cows
English
0021-8812
Animal feeding
Animal husbandry
Animal physiology Nutrition
Animal production
Artiodactyla
Behaviour
Bovidae
Bovinae
Cattle
Cereals
Cows
Dairy cattle
Domestic animals
Feeding habits
Livestock
Mammals
Physiological functions
Plant products
Production
Ruminants
Secretion
Useful animals
95-038144