The effects of parturition season and suckling mode on the puerperium of santa ines ewes and on the weight gain of lambs

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Influência do manejo de mamada sobre o retorno ao estro em ovelhas no pós-parto

Conduziu-se este estudo, com o objetivo de avaliar o retorno ao estro pós-parto de ovelhas submetidas a diferentes manejos de mamada. Foram utilizados 56 ovelhas Santa Inês e Bergamácia, 71 cordeiros e 3 rufiões. Os manejos de mamada (MM) foram: 1: contínua; 2: duas mamadas diárias; 3: mamada durante a noite. O período experimental foi dos 15 dias pós-parto até o desmame aos 60 dias. Até os 15, dias de idade os cordeiros permaneceram com suas mães em período integral. No MM 1, as ovelhas permaneceram com seus cordeiros em uma baia, em período integral. No MM 2, as ovelhas passaram a noite em uma baia e o dia em pastagem, momento em que não possuíam contato físico e visual com as crias. Seus cordeiros permaneceram em outra baia em período integral, para onde as ovelhas eram encaminhadas no momento da amamentação. No MM 3, as ovelhas passaram o dia em pastagem e a noite com seus cordeiros em uma baia, na qual os cordeiros permaneceram em período integral. Todas as ovelhas e todos os cordeiros receberam alimentação nas baias. Para identificação das ovelhas em estro foram utilizados rufiões, os quais permaneceram com elas em período integral. Os dados foram submetidos à análise de variância (PROC GLM, Sas®), e as médias comparadas por contrastes. O MM 2 possibilitou retorno ao estro pós-parto precoce quando comparado ao MM 3 e ao MM 1. Houve pouca ou nenhuma influência do anestro lactacional, pois 80% das ovelhas apresentaram estro durante a amamentação.

Efeito da suplementação sobre a digestibilidade dos nutrientes e desempenho de bezerros lactentes mantidos em pastagens de Brachiaria brizantha

This study evaluated the effect of supplementation and the type of supplement on nutrient digestibility and performance of lactating calves fed with Brachiara brizantha cv. Marandu pasture from February to May. The treatments were: supplementation in creep-feeding with protein concentrate, with energy concentrate, with energy-protein concentrate and without concentrate. In a Latin square design, four Canchim calves were kept in individual pens, receiving marandu hay and controlled suckling twice a day. The performance was evaluated in a completely randomized design, with 23 calves kept with the cows. Higher intake and nutrients digestibility (65% of dry mater digestibility) and calf performance (live weight gain of 0.98 kg day-1) were obtained with energyprotein concentrate, and the cows kept weight and body reserves during the experiment. The protein concentrate did not show good results, and was lower than the performance of calves without supplementation - 0.56 and 0.77 kg day-1, respectively. The performance of calves without supplementation was similar to calves receiving energy concentrate, but the cows lost more body weight and energy reserves. The supplementation with energy-protein concentrate for lactating calves fed with Brachiara brizantha cv. Marandu during the beginning of the dry season was benefifical for the performance of calves and cows.

Desempenho de cordeiras Bergamácia submetidas a dois sistemas de desmama

This study used 26 Bergamasca ewe lambs weaned at 60 days of age and separated into 2 groups - Artificial suckling: 10 ewes separated from their dams 48 hours after delivery and fed with cow's milk; Controlled suckling: 16 ewe lambs remained with their dams at pasture during the day and then separated at night, returning after morning milking. Following weaning, both groups were confined until they reached 38.6 kg average weight, and then separated into two types of treatment: Pasture rearing: 5 ewes from artificial suckling + 8 ewes from controlled suckling; Confined rearing: 5 ewes from artificial suckling + 8 ewes from controlled suckling. The experimental design was a 2 × 2 factorial, randomized. Average daily milk production for artificial suckling (0.318 kg) was higher than controlled suckling (0.256 kg). The economic return of the controlled suckling treatment was 8.13% higher than for artificial suckling. With regard to the pasture rearing and confined rearing treatment systems, there was no estrus for pasture rearing during experimental period. There was no difference between the weaning systems with regard to eggs per gram. The weaning system influenced the milk production of primiparous females.