3.8 Article

Production performance of cows raised with different postweaning growth patterns

Journal

TRANSLATIONAL ANIMAL SCIENCE
Volume 5, Issue 3, Pages -

Publisher

OXFORD UNIV PRESS INC
DOI: 10.1093/tas/txab031

Keywords

development; heifer; production

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The study aimed to compare the impact of growth patterns during the peri-pubertal period on the productivity of Bos taurus cows, with results showing that while there were differences between the stair-step growth pattern and a more constant nonobese growth pattern, there was no effect on calf production performance.
The period of heifer development is a relatively small fraction of a cow's life; however, her pattern of growth may have permanent effects on her productivity as a cow. We hypothesized that altering the growth pattern during the peri-pubertal period would increase life-time productivity across genetic types of Bos taurus cows. The objective was to determine the stayability, calf production, and weight of calf weaned across six calf crops. Heifers (n = 685) were placed on one of two developmental programs at 256 +/- 1 d of age. Control heifers received a diet that provided 228 kcal ME.(body weight [BW], kg) (-0.75) daily, and stair-step heifers were allocated 157 kcal ME.(BW, kg)-0.75 daily for 84 or 85 d, and then the daily allocation was increased to 277 kcal ME.(BW, kg)-0.75. Stair-step heifers (0.33 +/- 0.02 kg/d) had a lower average daily gain (ADG) than control heifers (0.78 +/- 0.02 kg/d; P < 0.001) during Period 1, and stair-step heifers (0.93 +/- 0.03 kg/d) had a greater ADG than controls (0.70 +/- 0.03 kg/d; P < 0.001) during Period 2. There were no treatment (P = 0.28) or breed type differences (P = 0.42) for the proportion of cows weaning a calf; however, the proportion of cows weaning a calf decreased with cow age (P < 0.001). Calves from stair-step dams had heavier weaning weights (193 +/- 1 kg) compared to control calves (191 +/- 1 kg; P = 0.007). There was not a treatment (P = 0.25) or breed type differences in cumulative BW weaned (P = 0.59). A diverse genetic population of cattle within B. taurus was tested and responses in calf production did not differ between stair-step growth pattern and a more constant nonobese growth pattern.

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