Performance, carcass characteristics and gain cost of feedlot cattle fed a high level of concentrate and different feed additives

Abstract

The objective of this study was to evaluate the effects of feeding cattle with isoprotein and isoenergetic diets, with and without the addition of polyclonal antibody preparation (PAP), yeasts (YST) or monensin sodium (MON) on performance, carcass characteristics and gain cost in feedlot. Ninety-five 20-month old bullocks (323.3±21.8 kg) were distributed in 25 pens. The completely randomized experimental design had a 2 × 2 + 1 factorial arrangement and the treatments were replicated 5 times. There was no effect of MON for DMI throughout the feedlot period; however, MON reduced the dry matter intake (DMI) in g/kg of BW in the first 28 days when compared with the other treatments. The gain cost decreased with MON addition in relation to the other treatments. Inclusion of YST decreased average daily gain (ADG), final body weight, hot carcass weight, carcass weight, gain to feed ratio and DMI in g/kg body weight, worsening feed conversion and increasing the gain cost in the feeding periods. Inclusion of PAP increased ADG and decreased the gain cost, besides improving feed conversion. For MON and PAP, a difference was found for kidney-pelvic fat and kidney-pelvic fat per 100 kg of hot carcass weight. For MON and YST, there was a difference in ADG, feed conversion, gain cost and carcass yield and kidney-pelvic fat per 100 kg of hot carcass. Treatment YST worsened performance in relation to the non-supplemented treatments. Feeding PAP to animals did not influence performance and carcass characteristics of bullocks in feedlot negatively. Thus, PAP shows potential to substitute MON in cattle feeding using isoprotein and isoenergetic diets.

Effects of dry yeast supplementation on growth performance, rumen fermentation characteristics, slaughter performance and microbial communities in beef cattle

“…In present study, cattle fed low plane of nutrition diet supplemented with ADY 4 g/head/d significantly increased ADG, and achieved to a comparable level with cattle fed with high plane of nutrition diet, which was in agreement with the research of Geng et al [18]. Previous studies have shown that the supplementation with ADY could increase ruminant animals DMI [19], however there were also some studies showed that DMI could be reduced [20,21]. Our results indicated that dietary supplementation with ADY had no significant effect on DMI, which was consistent with the result reported by Vyas et al [22].…”

Performance and carcass characteristics of lambs fed diets supplemented with different levels of Saccharomyces cerevisiae

“…Haddad and Goussous (2005) reported a higher daily weight gain in lambs that received 3 g d −1 Saccharomyces cerevisiae, and this variable related with increases in the digestibility coefficients of the organic matter, nitrogen, and neutral detergent fiber. The better feed conversion in our study related to Saccharomyces cerevisiae supplementation could indicate a higher feed digestibility and greater efficiency of nutrient utilization (Rodrigues et al, 2013;Elghandour et al, 2014;Arowolo and He, 2018). However, our results did not show differences in digestibility coefficients of the diet.…”

Using ruminally protected and nonprotected active dried yeast as alternatives to antibiotics in finishing beef steers: growth performance, carcass traits, blood metabolites, and fecal Escherichia coli1

“…Feed intake responses of beef cattle to live yeast (LY) supplementation have been variable; some studies reported increased DMI (Robinson, 2010;Habeeb, 2017), whereas, other studies stated a reduction of DMI (Rodrigues et al, 2013;Sartori et al, 2017). Furthermore, there appears to be more studies that report no impact of LY supplementation on DMI than studies that report positive or negative effects (Beauchemin, 2012).…”