SciELO - Scientific Electronic Library Online

vol.43 número2Animal effect and preweanig management on age at first calving in specialized dairy farms of Costa Rica.Productive potential evaluation of new forage grasses for dry savanas of the Caribbean in Colombia. índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados

  • Não possue artigos similaresSimilares em SciELO


Agronomía Costarricense

versão impressa ISSN 0377-9424


VALVERDE-ABARCA, Anthony; MADRIGAL-VALVERDE, Mónica; SOLIS-ARIAS, Jacobo  e  PANIAGUA-MADRIGAL, Wilfrido. The variability of the estimation methods of the boar sperm concentration. Agron. Costarricense [online]. 2019, vol.43, n.2, pp.25-43. ISSN 0377-9424.

The sperm concentration analysis in boar ejaculates is a quality measure in farms dedicated to the selling seminal doses and artificial insemination. The aim of this study was to determine differences in accuracy between assessment methods of sperm concentration. A total of 174 ejaculates from Duroc and Pietrain boars were analyzed. The animals belonging at the Agricultural Production Program (PPA) of the School of Agronomy at the Technological Institute of Costa Rica. The sperm concentration was estimated by 3 methods: sperm-densitometer (ED), spectrophotometer (EF) and computer assisted semen analysis (casa). The lower concentration (p<0.05) was estimated with EF (384.90±11.19 x106 and the highest with casa (432.39±20.81 x106 Concentration was analyzed using a generalized mixed model, including as explanatoryvariablesfromthemodelthevolumeof ejaculate, age of the boars, genetic line, collection interval, season and the interactions between the factors. The coefficient of variation was different (p<0.05) among methods and the highest was casa system (45.38%) while the lowest was ED method (34.78%). There were differences(p<0.05) between EF and casa estimation methods (376.65±12.06 vs 432.20±22.08 x106spermatozoa. ml-1) respectively, when the range between seminal extractions was low (≤9 days). Only casa system estimation was adjusted (p<0.05) and asymptotic level of concentration of 7.5 days was presented over the range between collections. In general, the estimation methods of concentration showed variability in the results. Duroc genetic lines presented higher sperm concentration than the Pietrain lines, independently of the estimation method. The volume of ejaculate presented a negative correlation with sperm concentration. The concentration decreases with increases the volume of ejaculate and the age of the boars.

Palavras-chave : Sperm concentration; semen; boar; reproduction; spermatozoa.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )