title: Qualitative parameters of the piapara semen (Leporinus elongatus Valenciennes, 1850).
abstract: Qualitative parameters of piapara semen (Leporinus elongatus) were evaluated before and after hormonal induction with carp pituitary extract at 2.5 mg.kg(-1) of live weight. The progressive motility, the spermatic vigor and the lifetime of the spermatozoa were higher before the hormonal induction (P > 0.05). The percentage of normal spermatozoa and spermatozoa with secondary pathologies did not differ (P > 0.05) between treatments: before induction (44.0 and 44.4%, respectively) and after-induction (44.3 and 46.7%, respectively). However, the percentage of primary pathologies was higher (P < 0.05) for the semen collected before induction than for the semen collected after induction; the estimates were 12.2 and 8.0%, respectively. The most frequent pathologies were the taillessness with the frequencies of 27.4 and 36.3% followed by the headlessness for which the estimates were 10.1 and 3.9%, before and after induction respectively. The semen collected before the hormonal induction presented better qualitative parameters.
authors.affiliation: Departamento de Zootecnia, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. danilo.streit@ufrgs.br
authors.forename: D P
authors.initials: DP
authors.lastname: Streit
authors.forename: R N
authors.initials: RN
authors.lastname: Sirol
authors.forename: R P
authors.initials: RP
authors.lastname: Ribeiro
authors.forename: G V
authors.initials: GV
authors.lastname: Moraes
authors.forename: L D M
authors.initials: LD
authors.lastname: Vargas
authors.forename: A L
authors.initials: AL
authors.lastname: Watanabe
mesh_terms: D000818:Animals; D002347:Carps; D005399:Fishes / Q000145:classification / Q000502:physiology*; D008297:Male; D010907:Pituitary Hormones / Q000494:pharmacology; D012661:Semen / Q000187:drug effects / Q000502:physiology*; D013081:Sperm Motility / Q000187:drug effects / Q000502:physiology*; D013094:Spermatozoa / Q000002:abnormalities / Q000502:physiology*
chemical_list: D010907:Pituitary Hormones