Influence of cellulase addition to dairy goat diets on digestion and fermentation, milk production and fatty acid content

Abstract

SUMMARYTwenty four French Alpine goats (39 ± 2·0 kg) were individually housed in a completely randomized design and fed a basal diet containing 146 g crude protein and 356 g neutral detergent fibre (NDF)/kg in the absence (control – CTRL) or presence (CELL) of 2 ml of cellulase/kg dry matter intake (DMI) for 70 days, which included a 10-day adaptation period. The feed was offered three times daily at 07·00, 13·00 and 19·00 h, but the single daily dose of cellulase was only fed at 07·00 h. Goats were hand-milked daily; milk production recorded and samples taken for compositional analysis. During the last 5 days of the experimental period, goats from each group were individually housed in stainless steel metabolic cages to enable separate and total collection of faeces and urine for nutrient digestibility and ruminal fermentation determinations. Goats fed CELL had greater DMI and greater digestibility of dry matter (DM), organic matter and NDF than CTRL goats. CELL goats had greater ruminal pH, concentration of acetic acid and concentration of propionic acid than CTRL goats. However, the concentration of ruminal butyric was lower in CELL goats compared with CTRL goats. CELL goats had greater milk yield, energy corrected milk, milk energy content, milk energy output and milk density than CTRL goats and the milk content for total solids, fat, protein and lactose were also greater for CELL goats than for the CTRL goats. The milk of CELL goats had greater palmitoleic acid, cis-10-heptadecanoic acid content and mono-saturated acids than the milk of CTRL goats and lower linoleic acid, linolenic acid contents and saturated fatty acids than the milk of CTRL goats. These results suggest that addition of 2 ml cellulase/kg DM of feed in the diet of lactating French Alpine goats elevated their milk production and improved its composition probably due to improved feed utilization.

Influence of the addition of exogenous xylanase with or without pre-incubation on the in vitro ruminal fermentation of three fibrous feeds

“…The high cost of cereals and quality forages has raised the interest in using fibrous roughages in the diet of ruminants (Rojo et al 2015;. Crop production is associated with the production of a number of harvesting residues and by-products, which may have important eco-doi: 10.17221/52/2015-CJAS nomic and environmental impacts.…”

“…Supplementing ruminant diets with fibrolytic enzymes has been shown to improve feed utilization and animal performance (Rojo et al 2015;Morsy et al 2016). However, the effectiveness of enzymes depends upon substrate, enzyme specificity, and enzyme dose (Lara-Bueno et al 2013;Elghandour et al 2015), resulting in variable responses.…”

Effectiveness of xylanase and Saccharomyces cerevisiae as feed additives on gas emissions from agricultural calf farms

“…The efficient reduction of such energy losses may be potentially used for the production of more meat and milk, rather than contributing to GHG production which impacts negatively on climate change (Eckard et al, 2010). Recently, the use of exogenous enzymes (Rojo et al, 2015) and yeast (Saccharomyces cerevisiae; SC) additives in ruminant diets has attracted considerable interest (Hassan et al, 2016). Many research studies have shown that supplementing exogenous enzymes in livestock diets improved forage quality , increase digestibility, rumen fermentation, and ruminant production (Valdes et al, 2015).…”

Effects of natural blends of garlic and eucalypt essential oils on biogas production of four fibrous feeds at short‐term of incubation in the ruminal anaerobic biosystem

“…Furthermore, some agricultural byproducts have been reported to have a low nutritional value for animals as a result of low nutrient digestibility and crude protein content, poor palatability, and high fibre content . Therefore, the efficacy of digestive utilization is reduced in the presence of those byprducts . For a better utilization of these agricultural byproducts in ruminant nutrition, an improvement of their nutritive value before feeding to an animal is necessary.…”

“…1,3 Therefore, the efficacy of digestive utilization is reduced in the presence of those byprducts. 4 For a better utilization of these agricultural byproducts in ruminant nutrition, an improvement of their nutritive value before feeding to an animal is necessary. Different strategies could be applied.…”