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Efeito da administraĆ§Ć£o de colostro fresco ou de colostro descongelado em vitelos
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Abstract(s)
O bom maneio do colostro Ć© um factor crucial na sanidade dos bovinos recĆ©m-nascidos, podendo ter consequĆŖncias a curto, mĆ©dio e longo-prazo. Uma das consequĆŖncias derivadas do mau maneio do colostro Ć© a ocorrĆŖncia de diarreias neonatais.
Este trabalho teve como objectivo estudar a relaĆ§Ć£o entre a administraĆ§Ć£o de colostro descongelado ou fresco e a prevalĆŖncia de diarreia neonatal numa exploraĆ§Ć£o leiteira no concelho de Idanha-a-Nova. Este estudo teve em conta a existĆŖncia de um plano profilĆ”tico contra a diarreia neonatal, sendo neste caso a vacinaĆ§Ć£o das vacas gestantes com Lactovac CĀ®, comparando posteriormente a existĆŖncia de relaĆ§Ć£o entre a prevalĆŖncia de diarreia neonatal e a administraĆ§Ć£o de colostro imunizado/nĆ£o imunizado.
Este estudo comportou 49 animais divididos em quatro grupos. Nos dois primeiros grupos foram colocados os animais que receberam colostro nĆ£o imunizado (Grupo1 - colostro descongelado; Grupo2 - colostro fresco) e nos dois Ćŗltimos foram colocados os animais que receberam colostro imunizado (Grupo3 - colostro descongelado; Grupo4 - colostro fresco). Os animais foram admitidos ao estudo apenas quando o colostro administrado obtivesse o estatuto de boa qualidade apĆ³s avaliaĆ§Ć£o com colostrĆ³metro. Em todos os indivĆduos foram medidos os valores de proteĆna total sĆ©rica atravĆ©s de refractĆ³metro Ć³ptico, observando-se, para o limite de 5,5g/dL, a passagem bemāsucedida de imunidade em 100% dos animais.
Os resultados obtidos no que diz respeito Ć eficĆ”cia da vacinaĆ§Ć£o, demonstram diferenƧa estatĆstica quanto Ć ocorrĆŖncia de diarreia nos grupos em estudo, quer em colostros descongelados (Grupo1/Grupo3 - p=0,046), quer em colostros frescos (Grupo2/Grupo4 - p=0,002).
JĆ” no que diz respeito Ć diferenƧa entre os grupos que receberam colostro descongelado e os que receberam colostro fresco, observa-se a nĆ£o existĆŖncia de diferenƧa na prevalĆŖncia de diarreia quer entre os grupos que receberam colostro imunizado (Grupo3/Grupo4 - p=0,055), quer entre os grupos que receberam colostro nĆ£o imunizado (Grupo1/Grupo2 - p=1), observando-se no entanto uma forte tendĆŖncia para a diminuiĆ§Ć£o de diarreia em animais administrados com colostro fresco imunizado.
Realizou-se a identificaĆ§Ć£o dos agentes responsĆ”veis das diarreias observadas nos grupos imunizados, chegando-se Ć conclusĆ£o que, dos agentes pesquisados (Escherichia coli, Cryptosporidium parvum, Rotavirus e Coronavirus), o Ćŗnico presente foi Cryptosporidium parvum, sugerindo a efectividade da vacinaĆ§Ć£o.
ABSTRACT - The effect of fresh or thawed colostrum administration in calves - Proper colostrum management is an important feature in newborn health and can have consequences in the short, medium and long-term. Scours in calves is one of the consequences derived from the poor colostrum management. This work was committed to study the relation between thawed or fresh colostrum and scours prevalence in a dairy farm in the municipality of Idanha-a-Nova. This study took into account the existence, or not, of a prophylactic plan against scours, which in this case was the vaccination of pregnant cows with Lactovac CĀ®, comparing subsequently the existence of a relation between scours prevalence and immunized/not-immunized colostrum administration. The study included 49 animals divided by four groups. The animals which received not-immunized colostrum were placed in the first two groups (Group1 - thawed colostrum; Group2 - fresh colostrum), and the animals that received immunized colostrum were placed in the last two (Group3 - thawed colostrum; Group4 - fresh colostrum). Animals were only admitted to the study if they were fed good quality colostrum, measured by colostrometer. Every animal serum total proteins were measured by refractometer, proving that, for a 5,5g/dL threshold, 100% of the animals had a well-successful passive transfer. The results obtained as to the vaccine efficacy demonstrated a statistical difference, both in thawed (Group1/Group3 ā p=0,046), and fresh colostrum (Group2/Group4 ā p=0,002). In what concerns the difference between thawed and fresh colostrum groups, we observed no statistical difference between the immunized colostrum groups (Group3/Group4 ā p=0,055), or in the not immunized colostrum groups (Group1/Group2 ā p=1), noting however a strong downward trend of diarrhea in animals administered with fresh immunized colostrum. Scour agents (Escherichia coli, Cryptosporidium parvum, Rotavirus and Coronavirus) were searched in the immunized groups but only Cryptosporidium parvum was detected, suggesting vaccination effectiveness.
ABSTRACT - The effect of fresh or thawed colostrum administration in calves - Proper colostrum management is an important feature in newborn health and can have consequences in the short, medium and long-term. Scours in calves is one of the consequences derived from the poor colostrum management. This work was committed to study the relation between thawed or fresh colostrum and scours prevalence in a dairy farm in the municipality of Idanha-a-Nova. This study took into account the existence, or not, of a prophylactic plan against scours, which in this case was the vaccination of pregnant cows with Lactovac CĀ®, comparing subsequently the existence of a relation between scours prevalence and immunized/not-immunized colostrum administration. The study included 49 animals divided by four groups. The animals which received not-immunized colostrum were placed in the first two groups (Group1 - thawed colostrum; Group2 - fresh colostrum), and the animals that received immunized colostrum were placed in the last two (Group3 - thawed colostrum; Group4 - fresh colostrum). Animals were only admitted to the study if they were fed good quality colostrum, measured by colostrometer. Every animal serum total proteins were measured by refractometer, proving that, for a 5,5g/dL threshold, 100% of the animals had a well-successful passive transfer. The results obtained as to the vaccine efficacy demonstrated a statistical difference, both in thawed (Group1/Group3 ā p=0,046), and fresh colostrum (Group2/Group4 ā p=0,002). In what concerns the difference between thawed and fresh colostrum groups, we observed no statistical difference between the immunized colostrum groups (Group3/Group4 ā p=0,055), or in the not immunized colostrum groups (Group1/Group2 ā p=1), noting however a strong downward trend of diarrhea in animals administered with fresh immunized colostrum. Scour agents (Escherichia coli, Cryptosporidium parvum, Rotavirus and Coronavirus) were searched in the immunized groups but only Cryptosporidium parvum was detected, suggesting vaccination effectiveness.
Description
DissertaĆ§Ć£o de Mestrado Integrado em Medicina VeterinĆ”ria
Keywords
Vitelos diarreia neonatal vacinaĆ§Ć£o colostro descongelado colostro fresco Calves scours vaccination thawed colostrum fresh colostrum
Pedagogical Context
Citation
GonƧalves, P.T.R. (2016). Efeito da administraĆ§Ć£o de colostro fresco ou de colostro descongelado em vitelos. DissertaĆ§Ć£o de mestrado. Universidade de Lisboa, Faculdade de Medicina VeterinĆ”ria, Lisboa.
Publisher
Universidade de Lisboa, Faculdade de Medicina VeterinƔria