Efeito da contagem de células somáticas no leite no desempenho reprodutivo de vacas leiteiras
The objective of this study was to evaluate the different levels of somatic cell counts and their correlation with the reproductive indices of dairy cows, in different stages of lactation in two production systems: compost barn and free stall. The work was developed in compost barn and free stall co...
| Autor principal: | Rottava, Cindia Mara |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2019
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/4620 |
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| Resumo: |
The objective of this study was to evaluate the different levels of somatic cell counts and their correlation with the reproductive indices of dairy cows, in different stages of lactation in two production systems: compost barn and free stall. The work was developed in compost barn and free stall confinement systems, different levels of somatic cell counts (<200; 201 to 400; 401 to 600;> 601 x 1000 cell / ml) were evaluated. These levels were mapped through samples individual dairy control, being measured in two phases of lactation (beginning and end of lactation). Within the somatic cell count levels studied, interference on postpartum clinical problems (placenta retention, hypocalcemia and mastitis) and the quality of the colostrum obtained were observed in addition to the pregnancy rate. The study was carried out in two distinct properties, one that adopts the Free stall system and another the Compost barn. The work was developed in two stages, the first with animals at the beginning of lactation and the second with the cows at the end of lactation. For both stages, the experimental design was completely randomized, distributed in a factorial scheme with four treatments (somatic cell levels) and 10 replicates (cows) for each property. After the collection and grouping of the data, the statistical analysis was carried out with the aid of the statistical package Genes, at 5% of significance. For the Compost Barn, the average CCS for each level was between the desired values, being 68.9; 258.4; 444.5 and 1112.5 x 1000 cells / ml respectively for levels <200; 201-400; 401-600 and <601 x 1000 cells / ml. The parameters, number of inseminations per pregnancy and period of service did not show interaction among the factors tested. When analyzed individually, there was a significant difference (P> 0.05) for the number of AIs at different somatic cell levels. These were superior to the two highest levels studied (401 - 600 and> 601 x 1000 cl / ml), not differing from the 201 - 400 x 1000 cl / ml level, thus, the lowest dose requirement for confirmation of gestation was found at the lowest CCS level. In the second phase, there was no significance (P> 0.05) for the variable calf weight at birth, regardless of the sex of the animal, on average presented 40.3 kg. Evaluating the amount of colostrum produced in 24 hours, it was verified that there was no significant difference (P> 0.05) at any level of CCS in milk, with a mean of 26.2 kg within 48 hours. For the study developed in P2, the mean CCS for the levels was: 47.4; 284.1; 484.4 and 1.507.0 x 1000 cells / ml respectively for levels <200; 201-400; 401- 600 and> 600 x 1000 cells / ml. The parameters, number of inseminations per gestation and period of service did not show interaction (P> 0.05) between the factors tested. When analyzed individually, there was a significant difference (P <0.05) for the number of AIs at different levels of somatic cells. the results indicate that young cows that had CCS levels below 400,000 cells / ml milk in the final lactation phase (before the dry period) produced smaller calves when compared to adult cows at the same CCS levels. However, for CCS levels in milk above 401,000 cells / ml, calf weight was similar among the categories studied. The quality of colostrum produced. Regardless of the level of CCS in milk at the end of the lactation phase, adult cows had colostrum of better quality. |
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