Lactational effects of adding a fibrolytic enzyme complex to the concentrate of lactating dairy goats

Abstract

Twenty-four multiparous Murciano-Granadina dairy goats in mid-lactation (wk 8 to 30) were used in a single cross-over design to evaluate the effects of supplementation with an exogenous fi brolytic enzyme preparation, characterized by cellulase and xylanase activities, on feed intake, milk yield and composition, and liveweight and body condition changes. Goats received ad libitum a basal total mixed ration composed of 65% forage and 35% concentrate. The treatments were: control (without enzyme) and experimental with enzyme (included at the recommended commercial dose of 4.7 ml/kg concentrate). Feed intake, milk yield, 4% fat corrected milk yield, and milk composition were not affected by enzyme supplementation, although milk casein content tended to decrease in the enzyme treatment. Body weight change tended to be higher with the enzyme treatment.

Exogenous Enzymes in Ruminant Nutrition: A Review

“…Supplementing dairy goat concentrate with a fibrolytic enzyme mixture enhanced DM and OM in vivo total tract digestibility (Gonzalez et al, 2008) (Table 2). A study by Hussain et al (2014) witnessed that the enzyme supplementation with the TMR resulted in 31.25% increase in net profit by improving the average daily weight gain significantly (83.49 g in treated group compared with 68.33 g in control) and by a non-significant (p = 0.2875) reduction of feed intake (Table 2).…”

<i>In vivo</i> digestibility and <i>in vitro</i> gas production of diets supplemented with fibrolytic enzymes in dairy goats

“…Diets and feeding procedure (once daily at 130% previous day intake) were also similar to those used in the previously done lactation experiment. Goats (4 per treatment) with body weight (BW), 41.7±1.6 kg, milk yield, 1.52±0.05 l/d and milk composition similar to the group average, were selected at the end of the previously done lactation experiment (wk 26) (González et al, 2008), and housed in individual collection crates from wk 27 to 30 of lactation (the last week being the collection period). During the collection week, offered and refused feed were recorded daily to determine voluntary intake.…”

“…Two culled goats (1 goat adapted per each diet treatment) from the previous lactation experiment (González et al, 2008) were euthanized with sodium pentothal (4 ml i.v., Laboratorios Abbott, Madrid, Spain) before feeding (8 h); these goats were used as donors of ruminal liquor for the incubations. Total rumen content was removed and equal amounts of cheese-cloth fi ltered rumen liquor were collected and used for preparation of inoculum solutions at the fi nal ruminal liquor to buffer proportion of 1:9.…”

“…The use of fi brolytic enzymes in ruminant diets has received considerable research interest in dairy cattle, although performance responses were variable Yang et al, 1999;Kung et al, 2000). The same controversial results have been observed in goats (Titi and Lubbadeh, 2004;González et al, 2008).…”

“…The objective of this study was to evaluate the effects of using an exogenous fibrolytic enzyme preparation, characterized by cellulase and xylanase activities, on the in vivo total tract digestibility and in vitro gas production and degradability of the diets previously tested in lactating Murciano-Granadina dairy goats (González et al, 2008).…”