Seminal characteristics of German Shepherd dogs

Sêmen de 25 cães da raça Pastor Alemão, com 1 a 7 anos de idade e pesando 30 a 35 quilos, foi coletado por masturbação. Com o objetivo de utilizar o material para inseminação artificial, colheu-se a segunda e parte da terceira fração, constatando-se, em média, volume de 7,17 ml; cor branca e aspecto leitoso; motilidade de 68,84%; vigor de 3,5; concentração de 136.192 espermatozóides por mm3 e de 889.772.000 por ejaculado; defeitos espermáticos maiores de 9,92% e menores de 7,62%. O pH do sêmen, dos diluidores e do sêmen diluído variou, respectivamente, de 6,02 a 6,60; 5,85 a 6,90; e 5,97 a 6,76; a pressão osmótica de 285,20 a 295,00; 240,00 a 310,00; e 272,32 a 303,92 mOsmois e a concentração de sódio e potássio, respectivamente, para o plasma seminal e os 4 diluidores, de 134,40 a 156,00; 7,80 a 13,72; 3,00 a 270,00; e 6,00 a 25,00 mEq/l. Verificou-se que entre cães, houve variação significante de todas as características seminais, exceto a pressão osmótica e, ainda, correlações entre os caracteres seminais e entre estes e os totais de patologias espermáticas. A variabilidade das características seminais entre os cães foi bem maior quando comparada entre as colheitas de cada animal, exceto a pressão osmótica e a concentração de sódio, que se apresentaram de maneira inversa.Semen was collected by masturbation from 25 German Shepherd dogs, 1 to 7 years old and weight from 30 to 35 kg. Aiming to utilize the semen for artificial insemination, only the second and partial third fractions were used. Results were as follows: mean ejaculation volume 7.17 ml; white colour and milky aspect: sperm motility 68.84%; vigour 3.5; concentration 136.192 spermatozoa/mm3 and 889.772.000 spermatozoa by ejaculation: 9.92% of major defects, 7.62% of minor defects and still an individual abnormalities classification. The pH of semen, of extenders and of extended semen, respectively, varied from 6.02 to 6.60; 5.85 to 6.90 and 5.97 to 6.76: osmotic pressure of 285.20 to 295.00; 240.00 to 310.00 and 272.32 to 303.92 mOlm and sodium and potassium concentrations, respectively, to seminal plasma and 4 extenders, 134.40 to 156.00 and 7.80 to 13.72 and 3.00 to 270.00 and 6.00 to 25.00 mEq/l. There was significant variation among dogs, in all seminal characteristics, except for osmotic pressure. There was also correlation between the seminal characteristics and between these and total sperm abnormalities. Variability of seminal characteristics among dogs is greater when comparing collections of each animal, with exception of osmotic pressure and sodium concentration variability that is reversed

Effect of crude protein levels and organic selenium supplementation in the diets fed during the breeding season on reproductive parameters of red-winged tinamous (Rhynchotus rufescens)

There is little information on the nutrition of red-winged tinamous (Rhynchotus rufescens) reared in captivity, and their nutritional requirements still need to be determined. This study aimed at determining dietary crude protein requirements and testing four organic selenium supplementation levels in the diet of red-winged tinamous during the breeding season. Birds were housed in a conventional broiler house divided in 16 boxes with one male and three females each. Iso-energy (2800kcal ME/kg) pelleted feeds, based on corn and soybean meal, were supplied in tube feeders. In the first experiment, treatments consisted of four different diets containing different crude protein (CP) contents (15, 18, 21, or 24%) and in the second experiment, the four diets contained equal protein level (22.5%) and four different organic selenium levels (0, 0.2, 0.4, or 0.8ppm). Data were analyzed by the least square method. The best egg weight and eggshell thickness were obtained with 22.5% dietary CP. Organic selenium did not influence the studied reproductive traits of red-winged tinamous (Rhynchotus rufescens) males or female