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RESUMO -Objetivou-se determinar a flutuação no nível de anticorpos séricos em cabras nos períodos pré e pós-parto e a eficiência do processo de aquisição de imunidade passiva em cabritos recém-nascidos utilizando colostros bovino e caprino, visando à avaliação de uma alternativa de manejo de colostro. Foram utilizadas 18 cabras e suas respectivas crias, num total de 33 animais. A coleta de sangue das cabras foi iniciada 45 dias antes da data prevista para o parto e foi realizada em intervalos de cinco dias até o 5 o dia após o parto. Os cabritos foram distribuídos em dois grupos: um grupo recebeu colostro caprino e o outro colostro bovino. As coletas de sangue foram feitas às 0, 12, 24 e 48 horas e aos 5, 10, 15, 17, 20, 25, 30, 35, 40, 50 e 60 dias de vida. Foram analisadas as concentrações séricas de proteína total e imunoglobulinas, além da concentração de imunoglobinas no colostro. O delineamento experimental foi o inteiramente casualizado e as variáveis séricas analisadas como medidas repetidas. A ausência de queda na concentração sérica de proteínas totais e imunoglobinas no período pré-parto indica que a mobilização de anticorpos para glândula mamária ocorre em concentrações que permitem o animal manter essas variáveis sem grandes alterações. No grupo que recebeu colostro bovino, a data de concentração máxima de proteínas totais (7,16 ± 0,28 g/dL)foi verificada às 48,68 ± 0,70 horas de vida e a de imunoglobinas, às 48,75 ± 0,73 horas, com média de 37,56 ± 2,38 unidades ZST (turvação por sulfato de zinco). No grupo que recebeu colostro caprino, os valores máximos de proteínas totais e imunoglobinas séricas ocorreram mais tardiamente, aos 20,05 ± 1,36 e 20,11 ± 1,72 dias de vida, com médias de 5,91 ± 0,22 g/dL e 28,17 ± 2,05 unidades ZST, respectivamente. O colostro caprino pode ser substituído pelo colostro bovino, que promove melhor aquisição inicial de imunoglobulinas aos neonatos.Palavras-chave: imunoglobulinas, pequenos ruminantes, proteína sérica, Saanen Fluctuation of serum variables in goats and comparative study of antibody absorption in new-born kids using cattle and goat colostrumABSTRACT -The objective of this study was to determine the fluctuation of serum antibodies in goats in the period before and immediately after kidding and the passive immunity acquisition efficiency in kids fed bovine and goat colostrum, to assess an alternative for colostrum management. Eighteen goats and their offspring were used in a total of 33 animals. Goat blood samples started to be collected 45 days before the predicated kidding date, at five-day intervals until the 5 th day post kidding. The kids were distributed in two groups: one group received goat colostrum and the other cattle colostrums. Blood collections were made 0, 12, 24 and 48 hours, and at 5, 10, 15, 17, 20, 25, 30, 40, 50 and 60 days of age. The serum concentration of total protein (TP) and immunoglobulins (Ig), and the colostrum IgG concentration were analyzed. A randomized complete design was used and the serum variables were analyzed as repea...

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Enteric histology of newborn goat kids fed lyophilized bovine colostrum (LBC) was studied. At 0, 7, and 14 h of life 15 male newborns received 5% of body weight of lyophilized bovine colostrum and 14 male newborns goat colostrum (GC), both with 55 mg/ml of IgG. Samples of duodenum, jejunum, and ileum were collected at 18, 36, and 96 h of life for analyses of villus height, crypt depth, muscle layer thickness, partial volume of the absorptive mucosa (Vv), density of the absorptive mucosa (Sv), and quantification of goblet cells. Three animals were sampled without colostrum intake (0 h). The histomorphometry was not different between GC and LBC in all segments. In the jejunum, the villus height differed in sampling times (36 h > 0 h and 18 h). The maximum villus height was observed in the jejunum. In the jejunum, crypt depth differed in the sampling times (96 h > 0 and 18 h). Interaction between intestinal segment and sampling times was observed to crypt depth (duodenum 18 h > jejunum 18 h and duodenum 96 h > ileum 96 h). In the ileum, the muscle layer thickness differed in the sampling times (36 h > 0 and 18 h and 96 h > 0 h). The greatest thickness of muscle layer was observed in the duodenum and at 96 h the muscle layer was thicker than at 18 h. The ileum showed the highest Vv at 36 h. The Vv was the highest in the jejunum and higher at 36 h than at 96 h. In the jejunum, an interaction between the treatment and sampling times to goblet cells number (LBC 18 h < GC 18 h and GC 96 h > LBC 96 h) was observed. The ileum showed the greatest number of goblet cells. The ingestion of lyophilized bovine colostrum did not determine any consequences for enteric histology in the first 4 days of goat kids' life.