Effect of somatic cell counts on milk on reproductive performance of cows

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 ( 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 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 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) para número de IA’s nos diferentes níveis de células somáticas. Sendo superiores para os dois maiores níveis estudados (entre 401 a 600 e maior que 601 x 1000 cél/ml), não se diferindo do nível entre 201 a 400 x 1000 cél/ml, sendo assim, a menor necessidade de doses para a confirmação de gestação foi encontrada no menor nível de células somáticas. Na segunda fase verificouse ausência de significância (P>0,05) para a variável peso do bezerro ao nascimento, independentemente do sexo do animal, em média apresentaram 40,3 kg. Avaliando a quantidade de colostro produzido em 24 horas, verificou-se que não houve diferença significativa (P>0,05) para nenhum nível de células somáticas no leite, sendo observada média de 26,2 quilogramas dentro do período de 24 horas. Para o estudo desenvolvido no free stall, a média de células somáticas para os níveis foi de: 47,4; 284,1; 484,4 e 1.507,0 x 1000 cél/ml respectivamente para os níveis menor que 200; entre 201 a 400; entre 401 a 600 e maior que 601 x 1000 cél/ml. Os parâmetros, número de inseminações por gestação e período de serviço não apresentaram interação (P>0,05) entre os fatores testados. Quando analisados individualmente, verificou-se diferença significativa (P