The influence of external and internal factors on the quality of semen collection and qualitative indicators of semen in the dog (Canis familiaris)

Abstract

VÁGENKNECHTOVÁ, M., HOŠEK, M., MÁCHAL, L., CHLÁDEK, G.: The infl uence of external and internal factors on the quality of semen collection and qualitative indicators of semen in the dog (Canis familiaris). Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 373-380 The infl uence of external and internal factors on the course of semen collection and quality of ejaculate has been evaluated in this work. This observation included 30 dogs of various breeds, each of which we collected 3 ejaculates from within one week (fi rst, third and fi h day). The internal factors included the weight of the dog, order of semen collection and the age of the dog. The external factors included type of housing, utilization of the dog, point of the collection and type of nutrition. Average length of preparation of a dog for a collection and onset of sexual refl ex was 95.7 sec. The observations showed that none of the evaluated internal factors had any infl uence on the length of preparation for the semen collection. The largest volume of ejaculate was collected from the fi rst collection (10.5cm 3 ), at the second collection it was 8.9 cm 3 and the third one the volume was the smallest -with only 6.6 cm 3 . The average volume of 8.7 cm 3 was found in the whole set of observed dogs. No statistically conclusive diff erence was found among groups. The average activity of sperm in the observed set was 68.8%. Activity declined from the fi rst to the third collection from 73% to 65.5%. The diff erence in sperm activity was not statistically conclusive in any indicator. Sperm concentration in whole set of dogs was 143.6 10 3 .mm −3 and was not signifi cantly aff ected by any monitored internal factors. The longest preparation for the collection was found in dogs housed in pens (134.4 sec), dogs living in households (84.7 sec) and the shortest preparation was needed in dogs with freedom of movement. The longest onset of sexual refl exes was found in Police forces dogs, then family dogs and sport dogs (130.0 sec, 97.8 sec and 68.3 sec). In dogs collected in laboratory, the emergence of sexual refl ex was longer (110.7 sec) than in dogs collected in their own natural environment (80.7 sec). The average length of the whole ejaculation was 396.0 sec in the whole set of dogs. The longest ejaculation was found in dogs held home (468.0 sec), the shortest in dogs with freedom of movement (290.0 sec). Family dogs had the longest ejaculation time, Police forces dogs had the shortest. The highest volume of semen was found in dogs kept in households (11.0 cm 3

Effect of bull, diluter and LDL-cholesterol concentration on spermatozoa resistance against cold shock

“…Indicators mentioned above belong to the main characteristics of collected fresh semen (Hanuláková et al, 2012) and determine the initial quality of ejaculate subsequently used for AI doses manufacturing (Vágenknechtová et al, 2011). The last fi ndings confi rm that the initial quality of ejaculate determines fi nal quality of AI dose (Beran et al, 2012).…”

The Quality of Frozen-thawed Canine Semen With Respect to Semen Extender Composition and Sequence of Ejaculate Collection in Dogs

“…In the case of frozen-thawed samples, half of the parameters (ALH, LIN, STR and WOB) did not diff er between the collections, but the BCF, VAP, VCL and VSL were signifi cantly higher in samples collected from the 2 nd collection. The relationship of the sequence of semen collection and sperm motility was investigated by Vágenknechtová et al (2011). These authors published that subjectively evaluated motility did not diff er among three consecutive collections within a week (fi rst, third and fi h day of a week).…”