High protein level effects during last gestation in beef cattle in offspring postnatal growth
A low prepartum nutritional level of the calf cow has been related to lower productivity in the progeny through the fetal programming mechanism. The excess of protein in late pregnancy on this mechanism is still little studied. This situation can be observed in systems that produce genetic material. The objective of the work was to evaluate the effect of a pastoral diet with a high protein level, during the last third of gestation, on the growth of the progeny. 16 pregnant multiparous Aberdeen Angus females fed with different protein levels during the last third of gestation were used: one on degraded pasture (PB 13.92% and Dig 65.5%) and the other on triticale (PB 18.2% and Dig 68 , 7%). The CP contributions were 10% and 59% higher than the daily requirements, respectively. A completely randomized experimental design with two replications was used and 8 animals were randomized to each treatment. Weight at birth, weight at 205 days, daily pre-weaning weight gain and weight at one year were evaluated. Higher protein intakes negatively affected growth potential (p <0.05), without affecting birth weight. The high levels of CP, being mainly degradable protein in the rumen, could generate a greater metabolic demand on the pregnant cow due to the effect of excessive uregenesis, which competes with other metabolic processes for metabolic energy and different metabolites, including methionine, an amino acid associated with fetal programming mechanism.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociacion Latinoamericana de Produccion Animal
2020
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| Online Access: | https://ojs.alpa.uy/index.php/ojs_files/article/view/2704 |
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