Effect of photoperiod on sexual activity of boar
Апстракт
The main objective of this study was to assess the effect of photoperiod on sexual activity of three breeds of boars: Swedish Landrace (n=34), Large White (n=38), and Duroc (n=32). Boar sexual activity was analysed based on the libido index and intensity of ejaculation. The libido index was calculated as the ratio between the duration of ejaculation and time of preparation until ejaculation. The intensity of ejaculation was the volume of ejaculate (mL) secreted in the unit of time (min). The effect of photoperiod was analysed as the effect of duration of daylight ( lt 12 h and >12 h) within photoperiod intervals (increasing and decreasing). Impact assessment was carried out by applying the General Linear Model procedure. Libido and intensity of ejaculation varied under the impact of photoperiod and the breed of boars. With the increase in age, the boar libido weakened, while the volume of ejaculate and intensity of ejaculation increased. Boars manifested better libido when the daylight... lasted longer than 12 h in both photoperiod intervals. Different from libido, the volume of ejaculate and intensity of ejaculation were highest when the daylight was shorter than 12 h, but only in the decreasing photoperiod interval. Swedish Landrace boars manifested best libido, while in the production of sperm the Duroc boars were inferior compared with Swedish Landrace and Large White. The phenotypic relationship among libido, ejaculate volume, and ejaculation intensity ranges from very low to high; however, the coefficients were positive, which indicates the possibility of simultaneous improvement of these traits.
Кључне речи:
breed / intensity of ejaculation / libidoИзвор:
Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science, 2015, 44, 8, 276-282Издавач:
- Revista Brasileira Zootecnia Brazilian Journal Animal Sci, Vicosa-Mg
Финансирање / пројекти:
- Примена различитих одгајивачко-селекцијских и биотехнолошких метода у циљу оплемењивања свиња (RS-31081)
DOI: 10.1590/S1806-92902015000800002
ISSN: 1806-9290
WoS: 000361060600002
Scopus: 2-s2.0-84941272948
Институција/група
Poljoprivredni fakultetTY - JOUR AU - Savić, Radomir AU - Petrović, Milica PY - 2015 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/3693 AB - The main objective of this study was to assess the effect of photoperiod on sexual activity of three breeds of boars: Swedish Landrace (n=34), Large White (n=38), and Duroc (n=32). Boar sexual activity was analysed based on the libido index and intensity of ejaculation. The libido index was calculated as the ratio between the duration of ejaculation and time of preparation until ejaculation. The intensity of ejaculation was the volume of ejaculate (mL) secreted in the unit of time (min). The effect of photoperiod was analysed as the effect of duration of daylight ( lt 12 h and >12 h) within photoperiod intervals (increasing and decreasing). Impact assessment was carried out by applying the General Linear Model procedure. Libido and intensity of ejaculation varied under the impact of photoperiod and the breed of boars. With the increase in age, the boar libido weakened, while the volume of ejaculate and intensity of ejaculation increased. Boars manifested better libido when the daylight lasted longer than 12 h in both photoperiod intervals. Different from libido, the volume of ejaculate and intensity of ejaculation were highest when the daylight was shorter than 12 h, but only in the decreasing photoperiod interval. Swedish Landrace boars manifested best libido, while in the production of sperm the Duroc boars were inferior compared with Swedish Landrace and Large White. The phenotypic relationship among libido, ejaculate volume, and ejaculation intensity ranges from very low to high; however, the coefficients were positive, which indicates the possibility of simultaneous improvement of these traits. PB - Revista Brasileira Zootecnia Brazilian Journal Animal Sci, Vicosa-Mg T2 - Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science T1 - Effect of photoperiod on sexual activity of boar EP - 282 IS - 8 SP - 276 VL - 44 DO - 10.1590/S1806-92902015000800002 ER -
@article{ author = "Savić, Radomir and Petrović, Milica", year = "2015", abstract = "The main objective of this study was to assess the effect of photoperiod on sexual activity of three breeds of boars: Swedish Landrace (n=34), Large White (n=38), and Duroc (n=32). Boar sexual activity was analysed based on the libido index and intensity of ejaculation. The libido index was calculated as the ratio between the duration of ejaculation and time of preparation until ejaculation. The intensity of ejaculation was the volume of ejaculate (mL) secreted in the unit of time (min). The effect of photoperiod was analysed as the effect of duration of daylight ( lt 12 h and >12 h) within photoperiod intervals (increasing and decreasing). Impact assessment was carried out by applying the General Linear Model procedure. Libido and intensity of ejaculation varied under the impact of photoperiod and the breed of boars. With the increase in age, the boar libido weakened, while the volume of ejaculate and intensity of ejaculation increased. Boars manifested better libido when the daylight lasted longer than 12 h in both photoperiod intervals. Different from libido, the volume of ejaculate and intensity of ejaculation were highest when the daylight was shorter than 12 h, but only in the decreasing photoperiod interval. Swedish Landrace boars manifested best libido, while in the production of sperm the Duroc boars were inferior compared with Swedish Landrace and Large White. The phenotypic relationship among libido, ejaculate volume, and ejaculation intensity ranges from very low to high; however, the coefficients were positive, which indicates the possibility of simultaneous improvement of these traits.", publisher = "Revista Brasileira Zootecnia Brazilian Journal Animal Sci, Vicosa-Mg", journal = "Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science", title = "Effect of photoperiod on sexual activity of boar", pages = "282-276", number = "8", volume = "44", doi = "10.1590/S1806-92902015000800002" }
Savić, R.,& Petrović, M.. (2015). Effect of photoperiod on sexual activity of boar. in Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science Revista Brasileira Zootecnia Brazilian Journal Animal Sci, Vicosa-Mg., 44(8), 276-282. https://doi.org/10.1590/S1806-92902015000800002
Savić R, Petrović M. Effect of photoperiod on sexual activity of boar. in Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science. 2015;44(8):276-282. doi:10.1590/S1806-92902015000800002 .
Savić, Radomir, Petrović, Milica, "Effect of photoperiod on sexual activity of boar" in Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science, 44, no. 8 (2015):276-282, https://doi.org/10.1590/S1806-92902015000800002 . .