Effects of dietary energy and starch concentrations for newly received feedlot calves: I. Growth performance and health1,2

The objective of this study was to evaluate the effects of dietary energy levels on growth performance, rumen fermentation and bacterial community, and meat quality of Holstein-Friesians bulls slaughtered at different ages. Thirty-six Holstein-Friesians bulls (17 months of age) were divided into a 3 × 3 factorial experiment with three energy levels (LE, ME and HE; metabolizable energy is 10.12, 10.90 and 11.68 MJ/kg, respectively) of diets, and three slaughter ages (20, 23 and 26 months). Results indicated that bulls fed with ME and HE diets had higher dry matter intake, average daily gain, and dressing percentage at 23 or 26 months of age. The ME and HE diets also reduced bacterial diversity, altered relative abundances of bacteria and produced lower concentrations of acetate, but higher butyrate and valerate concentrations in rumen fluid. Increasing in dietary energy and slaughter age increased the intramuscular fat (IMF) and water holding capacity. In summary, Holstein-Friesians bulls fed with ME and HE diets, slaughtered at 23 and 26 months of age could be a good choice to produce beef with high IMF. Slaughter age may have less influence than dietary energy in altering fermentation by increasing amylolytic bacteria and decreasing cellulolytic bacteria, and thus, further affecting meat quality.

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The Dietary Supplemental Effect of Nitroethanol in Comparison with Monensin on Methane Emission, Growth Performance and Carcass Characteristics in Female Lambs

Animals ◽

10.3390/ani11020327 ◽

2021 ◽

Vol 11 (2) ◽

pp. 327

Author(s):

Zhen-Wei Zhang ◽

Yan-Lu Wang ◽

Yong-Yan Chen ◽

Luo-Tong Zhang ◽

Ying-Jie Zhang ◽

...

Keyword(s):

Energy Loss ◽

Growth Performance ◽

Economic Efficiency ◽

Carcass Characteristics ◽

Basal Diet ◽

Nutrient Digestibility ◽

Dietary Energy ◽

Ch4 Production ◽

Net Revenue ◽

Emission Growth

This study was conducted to evaluate the dietary supplemental effects of 2-nitroethanol (NEOH) in comparison with monensin on methane (CH4) emission, growth performance and carcass characteristics in female lambs. Sixty female, small-tailed Chinese Han lambs (3.5 ± 0.3 month) were randomly allotted into three dietary treatment groups: (1) Control group, a basal control diet, (2) monensin group, the basal diet added with 40 mg/kg monensin, (3) NEOH group, the basal diet added with 277 mg/kg nitroethanol, and the feedlotting trial lasted for 70 days. Although dietary addition of monensin and NEOH did not affect nutrient digestibility of lambs, both monensin and NEOH decreased the calculated CH4 production (12.7% vs. 17.4% decrease; p < 0.01). In addition, the CH4 production represents less dietary energy loss in the monensin and NEOH group than in the control, indicating that monensin and NEOH are potent CH4 inhibitors that can reduce dietary energy loss. Dietary addition of monensin and NEOH decreased dry matter intake (p < 0.01); however, they increased the ADG of female lambs (p < 0.01). As a result, both monensin and NEOH increased feed conversion efficiency of the feedlotting lambs (p < 0.01), suggesting that feed energy saved from CH4 production promoted the feed efficiency and ADG in the present study. Except for the fact that NEOH addition increased the net muscle percentage to carcass weight (p = 0.03), neither monensin nor NEOH had a significant influence on carcass characteristics of female lambs (p > 0.05). From an economic point of view, NEOH and monensin caused a reduction in feed consumption costs, therefore resulting in a higher net revenue and economic efficiency than the control. In summary, dietary supplementation of NEOH in comparison with monensin presented a more promoting effect on energy utilization in female lambs by inhibiting rumen methanogenesis more efficiently, and NEOH improved the net revenue and economic efficiency more significantly than monensin.

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Effect of dietary energy density and folic acid supplementation on white striping occurrence and growth performance of broiler chickens

Canadian Journal of Animal Science ◽

10.1139/cjas-2020-0175 ◽

2021 ◽

Author(s):

Deborah Adewole ◽

Janice L MacIsaac ◽

Chengbo Yang

Keyword(s):

Folic Acid ◽

Energy Density ◽

Growth Performance ◽

Broiler Chickens ◽

Energy Levels ◽

Folic Acid Supplementation ◽

Normal Breast ◽

Dietary Energy ◽

White Striping ◽

Dietary Energy Density

Broilers were allocated to eight treatments consisting of two energy levels: Normal (NE) and High (HE), and four folic acid (FA) levels (2.2, 5, 10 and 15 ppm). On d 42, two male and two female chickens were euthanized per pen and white striping (WS) evaluation was performed on the Pectoralis major. Birds fed HE diets had reduced (P<0.05) FI and FCR than those on NE diets. With increasing FA levels, there was reduced (P<0.05) WS score, increased (P<0.05) normal breast fillet percentage in female but not in the male chickens. WS scores were higher (P<0.01) in male chickens than in the females.

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Effects of Dietary Energy Level and Slaughter Weight on Growth Performance and Grades and Quality Traits of the Carcass in Finishing Pigs

Journal of Animal Science and Technology ◽

10.5187/jast.2009.51.2.143 ◽

2009 ◽

Vol 51 (2) ◽

pp. 143-154 ◽

Cited By ~ 12

Author(s):

Man-Jong Park ◽

Jin-Yeun Jeong ◽

Duck-Min Ha ◽

Jeong-Cheol Han ◽

Tae-Geon Sim ◽

...

Keyword(s):

Energy Level ◽

Growth Performance ◽

Quality Traits ◽

Dietary Energy ◽

Finishing Pigs ◽

Slaughter Weight

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Performance and carcass evaluation of balami rams finished on diets with varying energy level

Nigerian Journal of Animal Production ◽

10.51791/njap.v44i2.992 ◽

2020 ◽

Vol 44 (2) ◽

pp. 223-229

Author(s):

S. B. Akinleye ◽

A. B. Omojola ◽

U. A. Offong ◽

K. D. Afolabi ◽

J. S. Luka

Keyword(s):

Growth Performance ◽

Energy Levels ◽

Descriptive Statistics ◽

Farm Animals ◽

Daily Weight Gain ◽

Carcass Quality ◽

Dietary Energy ◽

Genetic Status ◽

Study Performance

Fattening of farm animals is a way of increasing the rate of meat deposit after maturity. Its effectiveness depends on genetic status of the animal and the diet fed to the animal. In this study, performance and carcass evaluation of balami rams finished on diets with varying energy levels were carried. Forty-eight rams of Balami breed, weighing 20.75±1.50- 22.50±1.91kg were randomly alloted to four dietary energy levels (EL): 2.20Mcal/kg (EL ), I 2.40 Mcal/kg ((EL ), 2.60 Mcal/kg ((EL ) and 2.80 Mcal/kg ((EL ) for 90 days. The feed II III IV intake and daily weight gain of the animals in each treatment were determined and the average recorded. Three Balami rams were randomly selected from each treatment and sacrificed to determine the dressing percentage (DP), carcass weight (CW), fat deposit (FD) and meat yield (MY). Data were analysed using descriptive statistics and ANOVA at á . The 0.05 FBW (kg) of Balami rams in group EL , EL , EL and EL were 41.88.6±1.97, 42.12±1.84, I II III IV 46.13±1.65 and 52.24±2.50 while the FCR of animals on treatments EL (5.3±0.28) and EL I II (5.2±0.26) were higher than EL (4.7±0.82) and EL (4.0±0.65). The DP (%) were 54.9, III IV 54.9, 55.8 and 56.1, the FD (%) were 9.00,9.59,8.92 and 11.46 and the MY (%) were 75.2, 74.7, 75.5 and 72.0 for rams on EL , EL , EL and EL The results indicate that, increasing I II III IV. levels of energy improved growth performance and carcass quality of Balami rams. Therefore, higher level of dietary energy (2.80 Mcal/kgDM and 14% CP) could be suggested for optimizing growth performance and meat quality of Balami ram under fattening condition.

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