Effect of Exogenous Fibrolytic Enzyme Application on Productive Response of Dairy Cows at Different Lactation Stages

Abstract

This study aimed to evaluate effect of using exogenous fibrolytic enzymes on productive performance of dairy cows and milk curve response at different lactation stages. One hundred and sixteen multiparous cows were randomly assigned into two groups; fifty eight cows in each. Each group was contained 12 cows in early lactation 40±6 Days In Milk (DIM), 18 cows in mid lactation (122±4 DIM) and 29 cows in late lactation (216±2 DIM). The animals were fed total mixed ration with or without 15 g fibrolytic enzymes headG 1 dayG 1 for five weeks. Adding fibrolytic enzymes to dairy cows ration caused a significant increase in serum total protein and glucose concentration compared to control group, while Albumin, globulin, ALT, AST, alkaline phosphates activity and total bilirubin and urea concentration were not affected. Insignificant differences were observed in feed intake as dry matter, total digestible nutrient, crude protein and net energy lactation between the two groups. Enzymes supplementation to dairy cows rations increased milk yield, 4% FCM and ECM as well as milk fat contents compared to control group, while insignificant increased protein, lactose, total solid and solid not fat contents. Feed conversions as well as nitrogen efficiency utilization were significantly improved for treated group compared to control. Fibrolytic enzyme supplementation to dairy cows ration slightly increased positive slope (b-value) at early lactation compared to control group and no significant difference at mid lactation was observed. While, significant decrease in negative b-value was noticed for cows fed ration supplemented with fibrolytic enzymes compared to control group. It could be concluded that fibrolytic enzymes supplementation to dairy cows ration at early, mid and lactation has the potential to improve its productive performance as well as it is affect milk curve response.

Effect of Yeast Culture and/or Fibrolytic Enzymes Supplementation on Productive and Reproductive Performances of Dairy Egyptian Buffaloes

“…Yeast culture or fibrolytic enzyme supplementation did not significantly alter feed intake as DMI, TDN, and DCP (Table 5). The results of our study agreed with other studies (Salem et al 2013;Peters et al, 2015;El-Bordeny et al, 2015), They confirmed that adding enzymes had no effects on dairy cows or DM intake at different stages of lactation. Morrison et al (2001) YC culture was fed from 14 days before delivery to 14 days after delivery, and it had no effect on prenatal DMI.…”

“…These findings are in agreement with Bush (1991), who pointed out that the total serum protein concentration reflects the nutritional status of animals and is positively correlated with dietary protein levels. Also, El-Bordeny et al (2015) found that the blood glucose and total protein concentrations of the FENZ group increased compared with the control group. This was due to the improvement of the metabolic process, especially the increase of the apparent nutrient digestibility, the flow of protein and organic matter in the rumen and the microbial protein in the rumen Caused by.…”

“…Morrison et al (2001) YC culture was fed from 14 days before delivery to 14 days after delivery, and it had no effect on prenatal DMI. On the other side, Gado et al (2009) found that the DMI obtained by adding FENZ to dairy cows has increased, these cows have received total rations, or added forage before mixing with other ingredients or in TMR or concentrated diets (El-Bordeny et al, 2015). Finally, FENZ in the Bermuda grass-based TMR increases the intake of DM in dairy cows (Romero et al, 2016).…”

Effect of Fibrinolytic Microbes and Enzymes on Biochemical Blood Parameters in Crossbred Calves

“…The values of plasma GPT (32.13-39.32 U/l) and GOT (47.60-61.02 U/l) were within normal range indicating fibrolytic microbes and enzymes had no damaging effect on liver and/or muscles of crossbred calves. These findings on effect of treatments were in line with Morsy et al (2016) who indicated similar value of serum ALT (30.1-30.4 units/l) and AST (15.1-15.6 units/l) in Egyptian buffaloes fed two commercial enzymes, and similar were the observations in Holstein dairy cows fed 15 g fibrolytic enzyme (El-Bordeny et al, 2015). Hossain et al (2012) showed non-significantly lower serum AST (94.67 ± 4.99 and 88.67 ± 3.87 vs. 96.67 ± 6.39 μ/L) and higher serum ALT (40.00 ± 3.10 and 38.50 ± 3.49 vs. 37.83 ± 2.14 μ/L) in Kankrej calves fed diet supplemented with live yeast (Saccharomyces cerevisiae) at 5 and 10 g/day than the control group.…”

“…Contrary to present finding, Morsy et al (2016) indicated that an individual application of two commercial enzymes both at 40 g/day in total mixed ration of lactating buffaloes showed higher (p = 0.091) serum total protein (8.31 and 8.11 vs. 6.99 g/dL) in comparison to control. El-Bordeny et al (2015) found a significant increase (p < 0.05) in total serum proteins (8.83 ± 0.30 and 7.87 ± 0.26 g/dL) of Holstein dairy cows fed 15 g fibrolytic enzyme plus TMR. Similarly, higher (p < 0.05) total protein (6.68 ± 0.18 vs. 5.92 ± 0.25 g/dl) of calves was recorded when fed diet containing 5 and 10 g/day live yeast (Saccharomyces cerevisiae) as compared to control (Hossain et al, 2012).…”