Effect of abomasally infused casein on post-ruminal digestibility of total non-structural carbohydrates and milk yield and composition in dairy cows

Abstract

A study was conducted to evaluate the effect of abomasal infusion of casein on post-ruminal digestibility of starch and on milk yield and composition. Six multiparous Israeli Holstein cows in mid lactation, fitted with ruminal and abomasal cannulas, were used in a 3 ✕ 3 Latin-square experiment. Each cow received 1600 g maize starch infused into the abomasum. Treatments were: abomasal infusion of sodium caseinate at 0, 350, or 700 g casein daily. Chromium mordant neutral-detergent fibre (NDF) was used as a digesta marker. Casein infusion was associated with increases in post-ruminal and total-tract digestibility of non-structural carbohydrates and protein. Concentrations of rumen ammonia and of plasma insulin, glucose and urea were higher in casein-infused cows. Concentrations of milk protein and lactose and milk protein yield increased with casein infusion. Results indicate that increased protein flow to the abomasum can improve the yield of milk constituents in dairy cows. Digestibility and yield responses to infusion of 350 g casein per day were similar to those at 700 g/day. There was a tendency toward reduced milk protein efficiency in casein-infused cows. It is suggested that part of the production response can be related to a direct effect of protein supply and the rest can be explained by the indirect effect of improved carbohydrate availability in the small intestine.

Starch digestion site : influence of ruminal and abomasal starch infusion on starch digestion and utilization in dairy cows

“…However, large variation between treatments was found in regard to the partition of digestion of TNC between the rumen and the small intestine; digestibility of TNC was higher in the rumen of CON and SR than in SA and SCA (0·73 v. 0·49), while digestibility of TNC in the small intestine was highest (on total TNC intake basis) in the SCA cows (0·42), medium in the SA cows (0·30) and lowest in the CON and SR cows (0·18). The finding that casein flow to the small intestine of dairy cows, significantly increased TNC digestibility in the small intestine, is in accordance with previous studies on dairy cows (Bruckental et al, 2000 andAbramson et al, 2002) and steers (Richards et al 2002).…”

“…Consequently, replacement of dietary SBM by FM improved the overall efficiency of energy intake for production. Similar results were found by us (Bruckental et al, 1989(Bruckental et al, , 2000Abramson et al, 2002). The decrease in food intake might be a direct result of increased net output of glucose by the viscera and increased availability of glucose in the blood stream.…”

Relationships between postruminal casein infusion and milk production, and concentrations of plasma amino acids and blood urea in dairy cows: A multilevel mixed-effects meta-analysis

“…Two categorical explanatory variables were tested: stage of lactation and type of forage. Stage of lactation was based on (1) DIM at the initiation of the casein infusion as reported in the publication (early: ≤100 d; mid/late: >100 d); (2) stage of lactation as reported in the publication (early: Ørskov et al, 1977; mid/late: Derrig et al, 1974;Abramson et al, 2002;Relling and Reynolds, 2008); and (3) averaged milk yield in the data set (early: >24.5 kg/d; mid/late: ≤24.5 kg/d). The latter criterion was used for Vik-Mo et al (1974a,b), Rogers et al (1984), Rulquin (1986), and Choi et al (2013).…”

“…The data set included 23 experiments from northern European countries, 17 from North America, and 1 each from Israel (Abramson et al, 2002) and South Korea (Choi et al, 2013; Table 1). All-forage diets were fed in Dhiman et al (1993) and Khalili and Huhtanen (2002).…”

Comparative evaluation of raw and roasted soybean in lactating crossbred cows

“…Feeding of less soluble proteins may increase the amount of protein available for digestion and absorption in the lower digestive tract, ultimately resulting in more milk production. Milk production was improved when proteins or amino acids were infused abomasally (Abramson et al 2002), when proteins were treated with formaldehyde (Mondal and Chopra 2008) to reduce protein solubility and when diets were formulated to contain less soluble proteins (Fathi Nasri et al 2007a, b;Liu et al 2008). Diets supplemented with oilseeds improve the content of C18 unsaturated fatty acids and conjugated linoleic acid in milk fat, and soybeans seem to be the optimal source to improve the nutritive value of milk compared with other oilseeds (Liu et al 2008).…”