Effects of abomasal infusion of cottonseed oil and dietary enzyme supplementation on dairy goats

Abstract

Three lactating multiparous Sannen dairy goats in late lactation (146±7 days of milk) were used in a 3×3 Latin square design to determine the effects of abomasal infusion of cottonseed oil and dietary enzyme supplementation on milk yield and composition. Treatments were twice daily abomasal infusion of 1. 50 ml d -1 water plus 5 g kemzyme enzyme kg -1 dry matter (DM) of feed (ENZ), 2. 50 g cottonseed oil d-1 (OIL), and 3. 50 g cottonseed oil d -1 plus 5 g kemzyme enzyme kg -1 DM of feed (ENZ+OIL). Goats were fed a basal diet of 40% lucerne hay and 60% concentrates offered ad libitum. Each experimental period consisted of 14 days of adaptation and 5 days of total collection. Abomasal infusion of cottonseed oil decreased (P<0.05) DM intake and increased (P<0.05) milk fat percentage. Dietary supplementation of enzyme in the diet increased (P<0.05) DM and organic matter (OM) intake but had no effect (P>0.05) on apparent digestibility of DM, OM, crude protein, acid detergent fibre, neutral detergent fibre and ether extract. Cholesterol and plasma triglycerides increased (P<0.05) with cottonseed oil infusion but infusion of cottonseed oil with dietary enzyme supplementation had no (P>0.05) added benefit on lactational performance of the goats. These results suggest that abomasal infusion of cottonseed oil increased the amount of lipids reaching the mammary tissues and therefore increased milk fat percentage without altering milk yields.

Effects of exogenous fibrolytic enzymes on in sacco and in vitro degradation of diets and on growth performance of lambs

“…Exogenous fibrolytic enzymes have improved feed intake (Jalilvand et al, 2007;, which could be attributed to increased ruminal fibre digestion (Eun and Beauchemin, 2008), but the mechanism of this increment is not understood. The use of fibrolytic enzymes as feed additives to improve degradation of fibre has been studied under in vitro, in sacco and in vivo conditions, but the responses have been highly variable.…”

In vitro and in sacco evaluation of total mixed ration silage added different levels of chitosan

“…The actual values of nutrient degradation increased as the incubation period in the rumen lengthened. This occurs because the longer the feed particles are retained in the rumen, the greater the chance that bacteria may degrade nutrients, increasing the value of feed elements subjected to degradation (Jalilvand et al 2008). Furthermore, one of the key factors affecting the degradation of feed ingredients is the length of feed residence in the rumen.…”

“…The significant difference in "a" fraction between DMD and OMD might be due to different amounts of tiny particles present in each sample. There are two types of fine feed particle sizes according to Jalilvand et al (2008) and Kirwan et al (2022) that influence the value of the "a" fraction. Specifically, fine particles that leak from the bag and can ferment quickly; fine particles that are lost during washing but do not ferment, yet continue to make up "a" percent in the calculation of the degradation constant.…”