scholarly journals Effects of Dietary Energy Levels on the Physiological Parameters and Reproductive Performance of Gestating Gilts

2016 ◽  
Vol 29 (7) ◽  
pp. 1004-1012 ◽  
Author(s):  
S. S. Jin ◽  
S. W. Jung ◽  
J. C. Jang ◽  
W. L. Chung ◽  
J. H. Jeong ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Energy Levels ◽  
Physiological Parameters ◽  
Dietary Energy

Effect of postweaning implantation of zeranol and dietary energy level on growth and reproductive performance of replacement beef heifers

1991 ◽  
Vol 71 (2) ◽  
pp. 265-270 ◽  
Author(s):  
M. Makarechian ◽  
P. F. Arthur ◽  
M. A. Price
Keyword(s):  
Reproductive Performance ◽  
Energy Requirement ◽  
Energy Levels ◽  
Reproductive Traits ◽  
High Energy ◽  
Dietary Energy ◽  
Maintenance Energy Requirement ◽  
And Control ◽  
Calving Difficulty ◽  
Effect On Growth

Eighty-one heifer calves weaned at an average age of 6 mo were used to study the effect of postweaning zeranol implantation, on the growth and reproductive performance of heifers fed to grow slowly on three dietary energy levels. Forty heifers were implanted with 36 mg of zeranol at 30 d and again at 120 d postweaning. The remaining heifers were used as ummplanted controls. Within the implanted and control groups, heifers were subdivided into three groups and fed either a low, medium or high energy diet, which provided approximately 105, 130 and 160%, respectively, of NRC maintenance energy requirement, until 1 yr of age. The heifers were then turned out to pasture with hay supplementation. Heifers were exposed to bulls for 35 d at approximately 14 mo of age. Zeranol had no significant effect on growth. The effect of zeranol on the reproductive traits studied was not significant, although the trend was that the zeranol implanted heifers had lower calf crop born (52.3 vs. 63.6%) and lower incidence of calving difficulty (18.5 vs. 32.1%) than control heifers. The level of energy in the diet had a significant (P < 0.01) effect on growth of the heifers, with those on the high energy diet having the highest mean growth rate, but no significant effect on reproductive performance. Key words: Zeranol, dietary energy, growth, reproduction, heifers

Effects of dietary energy and lysine intake during late gestation and lactation on blood metabolites, hormones, milk compositions and reproductive performance in primiparous sows

2008 ◽  
Vol 88 (2) ◽  
pp. 247-255 ◽  
Author(s):  
S. Heo ◽  
Y. X. Yang ◽  
Z. Jin ◽  
M. S. Park ◽  
B. K. Yang ◽  
...  
Keyword(s):  
Energy Intake ◽  
Reproductive Performance ◽  
Research Council ◽  
Energy Levels ◽  
National Research Council ◽  
Late Gestation ◽  
Blood Metabolites ◽  
Dietary Energy ◽  
Improve Performance ◽  
Dietary Treatments

The effects of energy and lysine intake during late gestation and lactation on the reproductive performance of primiparous sows were evaluated using 36 gilts. Sows were allocated to six dietary treatments according to a 3 × 2 factorial arrangement and each treatment had six replicates. Three energy levels [low (EL), medium (EM) and high (EH)] and two lysine levels [low (LL) and high (HL)] were used. Gilts with HL intake had more weight (P = 0.004) and backfat thickness (P = 0.047) gain during gestation. Similar changes in sow body conditions were observed during lactation. HL intake resulted in higher litter birth weight (P = 0.001), weaning weight (P < 0.001) and growth rate (P < 0.001) and shortened wean-to-estrus interval (P= 0.001). Energy intake influenced the fat and lactose content while lysine intake influenced the total solids and protein content in milk and colostrum. Gilts with HL had higher insulin and lower creatinine levels during post farrowing and weaning, while triglyceride concentration at weaning increased with increasing of energy intake. The basal and pulses of LH were also influenced by lysine intake. In conclusion, higher lysine intake than those recommended by National Research Council (1998) could improve performance during late gestation and lactation in primiparous sows. Key words: Energy, lysine, gestation, lactation, sows

scholarly journals Effects of Dietary Energy on Growth Performance, Rumen Fermentation and Bacterial Community, and Meat Quality of Holstein-Friesians Bulls Slaughtered at Different Ages

Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1123 ◽  
Author(s):  
Haibo Wang ◽  
Hang Li ◽  
Fei Wu ◽  
Xinjun Qiu ◽  
Zhantao Yu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Growth Performance ◽  
Meat Quality ◽  
Energy Levels ◽  
Average Daily Gain ◽  
Rumen Fermentation ◽  
Dietary Energy ◽  
Different Ages ◽  
Slaughter Age

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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