Effect of the energy level of the diet in the last third of gestation on the productive and reproductive performance of beef cows and their offspring.
The objective of the experiment was to evaluate the productive and reproductive performance of cows fed on two energy levels in the last third of gestation and productive and reproductive performance of the offspring. Thirty-one multiparous pregnant British cows, carrying a female foetus, were assigned on Day -90 (Day 0=calving) to two levels of energy intake until parturition: i- 125 % of the requirements (ALTO; n=15) and ii- 75 % of the requirements (BAJO; n=16). After calving, mothers and calves (F1) remained together until weaning and all of the heifers were artificial inseminated at two years old. In the cows, live weight (PV), body condition (CC), the concentration of non-esterified fatty acids (AGNE), milk production and diagnosis of ovarian activity (DAO) were recorded. In the offspring (F1) the following parameters were analysed: in calves PV, GD and metabolic hormones, in heifers PV, CC and DAO and in their offspring (F2) PV and GD. The feeding treatments of cows affected the CC in the lactation period (4.2±0.04 for ALTO and 3.9±0.05 for BAJO, P˂0.05), the AGNE concentrations from calving to weaning (0.46±0.02 mmol/L for ALTO vs 0.37±0.02 mmol/L for BAJO, P=0.05), and the calving-conception interval (102±2.6 days for ALTO and 124±2.7 days for BAJO, P˂0.05) but did not affect milk production. Treatment of cows affected the PV at weaning (201±3.7 vs 188±4.1, P<0.05) and GD at weaning (0.90±0.02 vs 0.84±0.02, P<0.05) of (F1) cows. From weaning to puberty GD and PV of (F1) was not affected by treatments. Calves variables (F2) were not affected by treatments. The BAJO cows mobilized body reserve, maintained milk production and lengthened the calving conception period. Maternal nutritional restriction had an effect on offspring variables at weaning and thereafter were diluted.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociacion Latinoamericana de Produccion Animal
2022
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| Online Access: | https://ojs.alpa.uy/index.php/ojs_files/article/view/3028 |
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