João Vinícius Barbosa Roberto

Caroço de algodão na dieta de cabras saanen no semiárido paraibano

The present work aimed to evaluate the effects of the feed supplementation with different levels of cotton-seeds on milk production and the effect of environment on the physiological responses of Saanen goats in semiarid of Paraiba. Sixteen goats were used with average weight of 55kg ± 1,41kg. For milk production analysis, it was used a latin square design 4x4 (4 animals and 4 periods of 15 days) with four treatments and for the environmental and physiological parameters it was used a completely randomized design with two treatments (morning and afternoon) and 16 repetitions. In the analysis of milk production the treatments consisted in the inclusion of 4 levels of cotton seeds in the diet (0; 3; 6 and 9%), in the evaluation of environmental parameters and physiological treatments consisted of two shifts (morning and afternoon). Evaluated the environmental parameters air temperature, relative humidity, black globe temperature and physiological: respiratory rate, rectal temperature and surface temperature. In the environmental and physiological parameters was observed that there was effect of shifts (P < 0.05) with elevation ambient temperature and respiratory rate, rectal temperature and surface temperature. Regression analysis, we determined that there was no correlation between levels of cottonseed and average daily production of milk, so it is possible to conclude that the cotton seeds can be administrate as complement in the diet of goats in lactation and saanen goats, although they maintained homeothermy with increased respiratory rate, proved susceptible to the semi-arid climate.

Scrotum bipartite in sheep as a parameter indicative of adaptation to semi-arid climates: A thermographic and reproductive study

With the objective of assessing the influence of scrotum bipartition on scrotum-testiclar thermoregulation and semen quality in sheep native to a semiarid region, 14 adult crossbred rams were placed into groups, GI (7 with bipartition in the scrotum) and GII (7 without bipartition). Images were taken of the caudal scrotum surface using a Fluke (Ti25®) thermographic camera, for temperature analysis. Two semen collections were made, at an eight-day interval, by electroejaculation, to analyze macroscopic and microscopic parameters. It was observed that the surface temperatures of the proximal, medial and distal regions of the testicle and the epididymis tail did not present significant statistical difference (p > 0.05) between the groups. The GI showed a great ability to regulate the temperature in the tail region of the epididymis (p = 0.062), location of the bipartition, and the difference in temperature between the body surface and the epididymis tail was 0.54 °C much lower than the G2. Although no significant statistical difference (p > 0.05) was observed, the animals with bipartition presented higher means for body surface temperature, showing greater efficiency in heat dissipation and indicating that these animals used peripheral vasodilation on a larger scale to eliminate excess heat and thus had a lower energy expenditure. The semen parameters studied in both groups were within the desirable values for the species, with no differences between the groups (p > 0.05). Higher scrotum testiclar values were observed (scrotum circumference GI = 30.40 cm ± 0.53 and GII = 28.42 ± 1.13 cm, testicle length, right and left, respectively GI = 8.14 ± 0.90 cm, 8.00 ± 0.00 cm and GII = 7.28 ± 0.04 cm, 7.28 ± 0.48 cm) and bodyweight (GI = 44.57 ± 5.25 Kg and GII = 39.85 ± 1.57 Kg) in rams with scrotum bipartition (p > 0.05). It is concluded that scrotum bipartite in rams was shown to be an evolutionary indicator showing that animals with this characteristic dissipate heat more efficiently, have bigger scrotum-testicle biometrical parameters and heavier body weight. However, as the rams with scrotum bipartite presented division of less than 50% of the scrotum length, this degree did not influence the scrotum surface temperature and semen quality, as has been observed in goats with the same characteristic.

Medidas corporais e da carcaça de ovinos suplementados com diferentes níveis de sal forrageiro de faveleira

A suplementacao e uma importante forma de complementar a alimentacao dos animais de producao. Objetivou-se neste trabalho avaliar a inclusao de diferentes niveis de sal forrageiro nas medidas de biometria e morfometria da carcaca de ovinos mesticos Santa Ines x Dorper. Foram utilizados 30 ovinos machos, mesticos, com aproximadamente 150 dias de idade, os quais foram confinados em baias individuais. F oram distribuidos em um delineamento inteiramente casualizado com cinco tratamentos e seis repeticoes. Foram a limentados com feno de capim tifton-85 (FCT-85), agua e sal forrageiro de favela ( Cnidoscolus quercifolius) ad libitum . Apos a pesagem final e imediatamente antes do abate dos animais, procedeu-se, com auxilio de uma regua antropometrica e uma fita metrica, as avaliacoes biometricas dos animais e apos o abate, foram mensuradas as medidas externas e internas da carcaca. Nao houve diferenca estatistica (P<0,05) entre os niveis de sal forrageiro nas caracteristicas de biometria e as medidas morfometricas nao foram afetadas estatisticamente com a inclusao do sal forrageiro de favela. Concluiu-se que a inclusao de ate 99% do feno de faveleira nao alterou as caracteristicas de biometria e morfometria das carcaca de ovinos mesticos Santa Ines. DOI: 10.15528/2176-4158/rcpa.v17n1p1-6

Estudos da coloração do pelame em relação às respostas produtivas de ovinos mestiços sob estresse calórico

The aim of this research was to evaluate the yield responses of crossbred sheep Santa Ines with Dorper, with an average age of four months, 15 of dark coat and 15 of white coat, under heat stress. The animals were exposed to solar radiation for one hour per week (14.00 - 15.00) for eight weeks. Measurements of height of the dorsum, rump height, chest width, rump width, thoracic perimeter, thigh perimeter, hind perimeter and scrotal perimeter were made. The animals were slaughtered and were weighed the following components: blood, skin, liver, heart, kidneys, head, legs, lungs, testicles and penis / urethra. The gastrointestinal tract was weighed full and empty. The hot carcass weight and cold carcass weight and calculated cooling losses and hot carcass yield and cold were evaluated; beyond of the commercial cuts: palette, leg, neck, loin and rib. Finishing and carcass conformation and color assessment, marbling, texture and subcutaneous fat thickness were also evaluated. Black sheeps had heavier kidneys than the white sheeps. Testicles, the hot carcass, palette, leg, rib and rump width of black sheeps were lighter towards animals white fur. Heat stress can cause disturbances in the metabolism of sheep, affecting their body condition and altering its development.