Dinámica anual de peso y condición corporal en vacas de raza Criollo Argentino
Abstract
The pastoral and extensive breeding systems generally have low availability of forage reserves. In the subtropics, megathermic pastures present a period of rest and a period of growth, in which the grass is produced and reserved for the consumption of the whole year. The objective of this work was to analyze the annual dynamics of weight and body condition in Creole cows and its relationship with feeding. Information corresponding to the years 2011 to 2015 was used. The categories according to the age in years of the cows evaluated were: 5, 6, 7-10, 11-12, 13-14 and 15-16 years. Body weight and condition were recorded at the beginning (PES1 and CCES1) and at the end of the service (PSS and CCSS), at weaning of the offspring (PDTT and CCDTT) and at the beginning of the next service (PES2 and CCES2). In addition, the daily weight gain during the service (AMD1), end of service at weaning (AMD2), weaning to the next service (AMD3) and year-on-year (AMD4) were evaluated. GLM proc was used for the analysis. The model included cow age (ME) and year (AP) as fixed effects. For the comparison of means, the Tukey-Kramer test was used. On average, the CCES was 2.77 ± 0.16 with a weight of 406.7 ± 27.0 kg, while the average CCSS was 3.37 ± 0.16 with a weight of 442.8 ± 26.0 kg. The AMD1 resulted in 404 ± 20 g/d and 78 ± 52 g/d the mean of AMD2, increasing the CC 0.14 points. The cows entered the deferred forage period with a mean CCDTT of 3.5 ± 0.21. And from the practice of weaning to the next service, they lost weight and CC, with the average AMD3 -163 g/d ± 16. The CCES2 was 2.80 ± 0.17. The dynamics evaluated are important to be able to interpret reproductive results and plan possible nutritional strategies.
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