Effects of the Duration of Zilpaterol Hydrochloride Supplementation and Days on Feed on Performance, Carcass Traits and Saleable Meat Yield of Nellore Bulls

Caetano, Mariana; Goulart, Rodrigo Silva; Silva, Saulo da Luz e; Leme, Paulo Roberto; Pflanzer, Sérgio Bertelli; Santos, Andreza Negreli; Lanna, Dante Pazzanese Duarte

doi:10.3390/ani11082450

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…Although there was no significant difference in hot carcass weight and carcass yield, the animals showed differences in rump fat thickness. Dressing was like the average of other experiments with Nellore bulls aged close to 24 months (Caetano et al, 2015;Caetano et al, 2021;Parra et al, 2021). The mean final body weight, as well as the ADG, exceeded the estimated mean (556.5 kg for 103 days) based on the formulation targeting a weight gain of 1.5 kg d -1 .…”

Section: Discussionsupporting

confidence: 69%

Harvesting maturities of corn silage hybrids on the performance of finishing beef cattle

Volpato¹

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The corn harvest point for silage production can influence nutritional composition, nutrient availability, and ensiling efficiency. Corn hybrids may have characteristics that differentiate them and modulate the quality of the silage produced. The objective of this experiment was to evaluate whether the interaction between maturity and type of hybrid influences intake, intake behavior, and performance of finishing beef cattle fed diets containing whole-plant corn silage. The treatments were defined by the combination of maturity and types of hybrids: 1) hybrid A harvested with 105 DAS; 2) hybrid A harvested with 114 DAS; 3) hybrid B harvested with 105 DAS; and 4) hybrid B harvested with 114 DAS. For harvesting, a self-propelled harvester with a grain processor was used. For 103 days, sixty male Nellore cattle (402 kg ± 29 kg, and 20 months old) were used and housed in individual pens. In silage samples, analyses of chemical composition, pH, fermentation products, microbial count, particle distribution, and grain processing were carried out. The dry matter intake (DMI) of the bulls was determined daily. Animal-related variables were measured at the beginning of the experimental period and every 30 days. Harvesting WPCS with 114 DAS resulted in a higher variation in daily dry matter intake (105 DAS = 7.3 vs. 114 DAS = 8.7%). The hybrid and maturity interaction showed a tendency to influence DMI and average weight gain in the animals. Hot carcass weight and carcass yield were similar between treatments. Harvesting with 114 DAS resulted in less fat deposition on the rump (105 DAS = 11.5 mm vs. 114 DAS = 9.7 mm). Animals that received silage harvested with 105 DAS showed a higher preference for particles between 8 and 4 mm. In conclusion, late harvesting of whole-plant corn silage increases the variation in finishing beef cattle intake. Corn silage harvested with 114 DAS reduces rump fat deposition and the selection of small roughage particles. The consumption and weight gain of the animals indicated that the effects of advancing corn plant maturity may depend on the type of hybrid.

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Section: Discussionsupporting

confidence: 69%

Harvesting maturities of corn silage hybrids on the performance of finishing beef cattle

Volpato¹

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“…Moreover, the production of calves with high weaning weights is essential for the calfproducing industry's gross income and profitability (Yuste et al, 2020). In this regard, several research (Chamorro et al, 2017;Abitante et al, 2024) have examined the impact of supplemental feeding on performance before and after weaning. Before weaning, solid feed supplementation is thought to be essential for rumen development (Khan et al, 2016;Liu et al, 2022), which is important for later adaption to roughage diets.…”

Section: Introductionmentioning

confidence: 99%

Feeding calf starter: growth performance of crossbred dairy calves

Siddiki,

Khandakar,

Abunaser

et al. 2024

Asian Australas. J. Biosci. Biotechnol.

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Calf starter is a special feed preparation that is fed to calves to ensure smooth weaning of calves. The study was conducted to evaluate the growth performance of crossbred dairy calves (Holstein-Friesian crossbred, HFX and Sahiwal crossbred, ShX) feeding a readily fermentable calf starter diet. The duration of the study was 17 weeks of which the first week was for the adjustment period. Ten healthy crossbred heifer calves of average 40 days old were selected for this purpose and they were divided into two groups according to their genetic materials (5 HFX and 5 ShX) in a completely randomized design. The calves were fed initially 0.25kg/day/calf of starter feed which was gradually increased up to 1 kg/day/calf. In addition to calf starter, a predetermined amount of whole milk (2 kg/day/calf) and ad libitum amount of green grass were also supplied to the calves. During the experimental period, growth parameters viz. body weight gain, body length gain, wither height gain, and hip height gain was measured weekly. After the whole study period, no significant difference (P>0.05) was found in case of the average weekly body weight gain and all the body measurements. The results suggest that calves fed a balanced calf starter can grow identically overcoming any breed variations. However, to provide a clearer idea about the effect of calf starter on different crossbred dairy calves broad-scale research should be conducted on an advanced level including more crossbreds or pure breeds. Asian Australas. J. Biosci. Biotechnol. 2024, 9(1), 4-9

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Dietary energy level and β2-adrenergic agonist supplementation on growth performance, dietary energy, carcass traits, and visceral mass of hairy lambs

Castro-Pérez,

Escobedo-Gallegos,

Mendoza-Cortez

et al. 2024

Anim. Prod. Sci.

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Context The beta-agonist zilpaterol (ZH) is a feed additive that improves growth performance via protein accretion during the finishing phase of ruminant fattening. However, evaluating the possible interaction between ZH and nutrients of the diet has received limited attention. Aims We investigated the changes in growth performance and carcass traits in response to ZH supplementation of hairy lambs fed finishing diets with different energy concentration. Methods Forty-eight Pelibuey × Katahdin crossbred male lambs (43.8 ± 6.3 kg) were used in a 34-day feeding trial to evaluate the interaction between diet energy density [8.37 (LE) and 8.79 (HE) MJ of net energy for maintenance (NEm) per kilogram of diet] and zilpaterol hydrochloride supplementation (ZH, dosed at 0 or 6 mg ZH/kg) on growth performance, carcass traits, and visceral mass. All diets contained 14.5% crude protein (CP). Key results There was no interaction of energy level and ZH in any of the variables evaluated. HE increased average daily gain (ADG) and gain efficiency (GF) without affecting the observed-to-expected dietary NE. Zilpaterol supplementation increased ADG, GF, and observed-to-expected dietary NE. Both HE and ZH increased carcass weight. HE increased carcass fat, whereas ZH decreased it. HE increased dressing percentage. ZH increased longissimus muscle area, the muscle:fat ratio in the shoulder, and leg whole-cut proportion. Visceral mass was not affected by energy level. ZH decreased visceral fat. Conclusions Increasing diet energy from 8.37 to 8.79 MJ NEm/kg enhanced growth performance and carcass traits but did not improve dietary energy utilization. Supplemental ZH enhanced growth performance, dietary-energy utilization and carcass traits of lambs. Implications ZH supplementation is a tool to enhance growth performance by improving protein accretion and reducing carcass fat. Response to ZH supplementation is independent of the differences in energy density of finishing diets.

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Effects of the Duration of Zilpaterol Hydrochloride Supplementation and Days on Feed on Performance, Carcass Traits and Saleable Meat Yield of Nellore Bulls

Cited by 3 publications

References 38 publications

Harvesting maturities of corn silage hybrids on the performance of finishing beef cattle

Harvesting maturities of corn silage hybrids on the performance of finishing beef cattle

Feeding calf starter: growth performance of crossbred dairy calves

Dietary energy level and β2-adrenergic agonist supplementation on growth performance, dietary energy, carcass traits, and visceral mass of hairy lambs

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