Influência do Parto na Pelvimetria de Vacas da Raça Guzerá

Foram medidos os diâmetros bi-iliaco superior (dorsal), bi-iliaco inferior (ventral) e vertical da pelve em 273 femeas de bovinos da raca Guzera (Bos indicus), com o proposito de verificar eventuais correlacoes daqueles com a idade, altura, comprimento, perimetro toracico e peso do animal, na decorrencia de um ou mais partos. As avaliacoes foram feitas in vivo com o auxilio do aparelho preconizado por Menissier; Vissac (1971). No computo geral foram obtidos as seguintes medias para os grupos de femeas nuliparas, primiparas e multiparas respectivamente: diâmetro bi-iliaco superior, 13,10; 14,17; 15,14 cm; diâmetro biiliaco inferior, 11,92; 13,05; 13,99 cm e diâmetro vertical, 17,17; 17,98; 19,26 cm as analises estatisticas revelaram correlacao entre os valores dos diâmetros e as outras mensuraveis corporeas; a variacao do diâmetro bi-iliaco inferior, e a mais influenciada pelo numero de partos, enquanto que o diâmetro vertical, neste aspecto e o que se altera menos. Segundo o teste de Tukey (nivel de significância de 1%), as modificacoes metricas observadas nesses diâmetros sao significantes entre nuliparas, primiparas e multiparas e estao mais relacionadas com o aumento da largura (diâmetro bi-iliacos) do que com a altura (diâmetro vertical) da propria pelve. Palavras-chave: Bovinos; Pelvimetria; Pelviologia; Parto. ABSTRACT There were measured the main diameters (the dorsal and ventral bi-iliac and the vertical) in 273 Guzera females (Bos indicus), to observe its eventual correlation with age, height, lenght, thoracic perimeter and weight of the animal after the occurrence of one parturition or more than one. The measures were made in vivo with the help of a Menissier and Vissac pelvimeter. There were obtained the following medias in each group: Nuliparous dorsal bi-i1iac 13,10 cm; ventral bi-iliac diameter 11,92 cm and ventral diameter 17,17 cm; Primiparous respectively 14,17; 13,05; 17,98 cm; Multiparous, in the some order, 15,14; 13,99; 19,26 cm. The statistical analyses had showed correlation between the diameter scores and the other body mensurations. The dimension of the ventral bi-i1iac diameter is the most related to the number of parturitions and the vertical diameter is the less altered. According the Tukey (significance level 1%) the changes that were reported in the pelvic diameters are significant between nuliparous, primiparous and multiparous females and they are related more with the increase of the widths than the increase of the height of the pe1vis itself. Key words: Cows; Pelvimetry; Pelviology; Parturitions.