SciELO - Scientific Electronic Library Online

 
vol.47 número4Effect of dietary yeast autolysate on performance, slaughter, and carcass characteristics, as well as blood parameters, in quail of both gendersEvaluation of production and reproduction of three South African Angora goat CYP17 genotypes índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google

Compartilhar


South African Journal of Animal Science

versão On-line ISSN 2221-4062
versão impressa ISSN 0375-1589

Resumo

PIETRUSZKA, A.; JACYNO, E.; SOSNOWSKA, A.  e  KAWęCKA, M.. Effects of birth weight and standardized litter size on growth performance of boars and subsequent reproductive performance. S. Afr. j. anim. sci. [online]. 2017, vol.47, n.4, pp.471-477. ISSN 2221-4062.  http://dx.doi.org/10.4314/sajas.v47i4.6.

The aim of this study was to investigate the effects of birth weight and rearing litter size on growth and reproductive performance of boars. One hundred and forty male piglets were allotted to two groups, based on litter size: a smaller litter (SL) (8 piglets/litter, 70 boars) and a larger litter (LL) (12 piglets/litter, 70 boars). The boars in these litters were separated into two birth weight subgroups: lower birth weight (LBW) (mean: 1.15 kg, 70 boars) and greater birth weight (GBW) (mean: 1.59 kg, 70 boars). Testes volume, sexual activity and semen quality of boars at 180 days old were evaluated. The males in the GBW group, when compared with the LBW group, had greater bodyweight at 21, 28, and 63 days old (P <0.01) and 180 days old (P <0.05), greater testes volume and semen volume (P <0.05), greater sperm concentration and total number of sperm in the semen (P <0.01) and a longer ejaculation time (P <0.05). The boars in the SL group had greater (P <0.01) bodyweight at 21 and 28 days old, greater (P <0.05) sperm concentration and total number of sperm in the semen than boars in the LL group. These results indicate that birth weight is a good predictor of sperm production in adult boars and suggest the possibility of increasing sperm production in adult boars by reducing the litter size in which they are reared.

Palavras-chave : Boars; bodyweight; piglets; reproduction; semen.

        · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons