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Avaliação da eficácia de reutilização de CIDR Ovis® em ovinos de leite
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Abstract(s)
O CIDR (do Inglês Controlled Internal Drug Releasing) é um dispositivo intravaginal impregnado
de progesterona natural, utilizado para sincronização e manipulação do estro e ovulação em pequenos
ruminantes. O presente estudo teve por objetivo avaliar a eficácia da reutilização de CIDR ovis®0,35g
(ZoetisÒPortugal), num protocolo combinado de d-cloprostenol e eCG (gonadotrofina coriónica equina),
com duração de 11 dias em ovinos de raça Lacaune, provenientes da mesma exploração e com média
de dias em leite semelhantes. Para tal, a amostra foi dividida em três grupos de estudo: CIDR1 (n=20
animais), com utilização de CIDR em aplicação de novo; CIDR2 (n=20 animais) com uso de CIDR em
“reutilização imediata”, e CIDR3 (n=17 animais) com uso de CIDR em “reutilização tardia”. Nos 3 grupos
em análise, foi avaliada a variação da concentração sérica de progesterona (P4), em amostras de
sangue recolhidas aos dias 0, 5 e 11 pós-aplicação do CIDR. Posteriormente, todas as ovelhas foram
colocadas à cobrição natural, num lote comum e num rácio macho:fêmea de 1:7. Foi registada a taxa
de retenção do CIDR, os dados reprodutivos (taxa de submissão, taxa de conceção e prolificidade) e a
tipologia de parto (eutócico ou distócico) nos três grupos.
A concentração sérica de P4 em todos os grupos foi superior a 1 ng/ml nos três momentos de
medição. A taxa de retenção do dispositivo ao longo dos 11 dias de protocolo revelou-se superior nos
grupos CIDR3 e CIDR2, e menor em CIDR1. As taxas de conceção obtidas no primeiro e segundo
momento de diagnóstico ultrassonográfico não diferiram. A taxa de partos foi semelhante à taxa de
conceção. Relativamente à tipologia de parto, o grupo que apresentou um maior número de partos
distócicos foi CIDR2, enquanto que CIDR1 foi o grupo que apresentou maior número de partos
eutócicos. A análise da prolificidade revelou que CIDR3 foi o grupo que apresentou um maior número
médio total de crias, nados vivos e nados mortos por parto. Apesar destas diferenças verificadas,
quando analisado estatisticamente o efeito da reutilização nos diferentes fatores avaliados, não se
evidenciaram diferenças estatisticamente significativas (p>0,05).
Desta forma, a sincronização éstrica com CIDR ovisÒ 0,35g em protocolos de 11 dias, sob a
forma imediata ou tardia, pode ser executada com eficácia semelhante. A reutilização destes
dispositivos contribui para a maximização da rentabilidade, eficácia e eficiência reprodutiva no
quotidiano das explorações. A reutilização integra-se ainda na aplicação prática da abordagem One
Health.
The CIDR (Controlled Internal Drug Releasing) is an intravaginal device impregnated with natural progesterone, used for synchronization and manipulation of estrus and ovulation in small ruminants. The present study aimed to evaluate the effectiveness of the reused CIDR ovis™0.35g (Zoetis™Portugal) in an 11 day protocol, combined with d-cloprostenol and eCG (equine chorionic gonadotropin), in Lacaune sheep, from the same farm and with a similar average of days in milk. Animals were divided into three study groups: CIDR1 (n = 20 animals), with the use of CIDR in new application; CIDR2 (n = 20 animals) using CIDR in “Immediate Reuse”, and CIDR3 (n = 17 animals) using CIDR in “Late Reuse”. The effectiveness of the protocols was assessed by measuring serum progesterone levels (P4), in blood samples collected on days 0, 5 and 11 after application of the CIDR. Subsequently, all the sheep were placed under natural service, in a common lot and in a male:female ratio of 1:7. The CIDR retention rate, reproductive data (submission rate, conception rate, and prolificity) and type of birth (eutocic or dystocic) in the three groups were recorded. The serum P4 concentration in all groups was greater than 1 ng/ml in the three measurement times. The retention rate of the device over the 11 days of the protocol was higher in groups CIDR3 and CIDR2, and lower in CIDR1. The conception rates obtained in the first and second moments of ultrasound diagnosis did not differ. The birth rate was similar to the conception rate. Regarding the type of birth, the group with the highest number of dystocia was CIDR2, while CIDR1 was the group with the highest number of eutocic births. The analysis of prolificity revealed that CIDR3 was the group that had the highest average total number of offspring, live births and stillbirths. Despite these differences, when analyzing the effect of reutilization on the different factors evaluated, no statistically significant differences (p> 0.05) were observed. Thus the estrous synchronization with reused CIDR ovisÔ0.35g in 11 day protocols, either in the immediate or late form, can be performed with similar effectiveness. The reutilization of these devices contributes to the maximization of profitability, effectiveness and reproductive efficiency in the daily life of the farms. Reused devices also fit and accommodate the practical application of the “One Health” approach.
The CIDR (Controlled Internal Drug Releasing) is an intravaginal device impregnated with natural progesterone, used for synchronization and manipulation of estrus and ovulation in small ruminants. The present study aimed to evaluate the effectiveness of the reused CIDR ovis™0.35g (Zoetis™Portugal) in an 11 day protocol, combined with d-cloprostenol and eCG (equine chorionic gonadotropin), in Lacaune sheep, from the same farm and with a similar average of days in milk. Animals were divided into three study groups: CIDR1 (n = 20 animals), with the use of CIDR in new application; CIDR2 (n = 20 animals) using CIDR in “Immediate Reuse”, and CIDR3 (n = 17 animals) using CIDR in “Late Reuse”. The effectiveness of the protocols was assessed by measuring serum progesterone levels (P4), in blood samples collected on days 0, 5 and 11 after application of the CIDR. Subsequently, all the sheep were placed under natural service, in a common lot and in a male:female ratio of 1:7. The CIDR retention rate, reproductive data (submission rate, conception rate, and prolificity) and type of birth (eutocic or dystocic) in the three groups were recorded. The serum P4 concentration in all groups was greater than 1 ng/ml in the three measurement times. The retention rate of the device over the 11 days of the protocol was higher in groups CIDR3 and CIDR2, and lower in CIDR1. The conception rates obtained in the first and second moments of ultrasound diagnosis did not differ. The birth rate was similar to the conception rate. Regarding the type of birth, the group with the highest number of dystocia was CIDR2, while CIDR1 was the group with the highest number of eutocic births. The analysis of prolificity revealed that CIDR3 was the group that had the highest average total number of offspring, live births and stillbirths. Despite these differences, when analyzing the effect of reutilization on the different factors evaluated, no statistically significant differences (p> 0.05) were observed. Thus the estrous synchronization with reused CIDR ovisÔ0.35g in 11 day protocols, either in the immediate or late form, can be performed with similar effectiveness. The reutilization of these devices contributes to the maximization of profitability, effectiveness and reproductive efficiency in the daily life of the farms. Reused devices also fit and accommodate the practical application of the “One Health” approach.
Description
Keywords
CIDR Ovinos Reutilização Sheep Reuse