Table 2 Least square means (± s.e.) for semen viability of boar semen following frequency (24- or 92-h intervals) of ejaculation
Frequency of ejaculation (h)
Semen volume (mL) Sperm motility (%)
Type of movement (0-10) Live sperm (%)
Sperm conc./mL (x106)
Total sperm/ejaculate (x109) Normal acrosome morphology (%)
24
124.9a ± 5.7 55.2a ± 0.9 3.0a ± 0.1 57.9a ± 12.6 90. 4a ± 12.1 52.5a ± 4.6 55.5a ± 15.6
92
288b ± 9.3 87.1b ± 3.3 8.7b ± 0.5 78.3b ± 9.6 132.6b ± 8.1 83.2b ± 7.7 92.5b ± 18.4
a, b Means with different superscripts in a row are significantly different (P <0.01).
For experiment 2, semen characteristics of the last four ejaculates collected on the 24 and 96-h schedule, respectively are shown in table 2. Ejaculates collected at the 96-h intervals had larger volumes (288 ± 9.3 vs. 124.9 ± 5.7 mL), sperm motility (87.1 ± 3.3 vs. 55.2 ± 0.9%), progressive sperm movement (8.7 ± 0.5 vs. 3.0 ± 0.1), live sperm (78.3 ± 9.6 vs. 57.9 ± 12.6), sperm concentration per milliliter (132.6 ± 8.1 vs. 90. 4 ± 12.1 x106), total sperm per ejaculate (83.2 ± 7.7 vs. 52.5 ± 4.6 x109) and normal acrosome morphology (92.5 ± 18.4 vs. 55.5 ± 15.6%) than ejaculates collected on the 24-h intervals at P <0.01.
These results are in accord with an earlier report by Umesiobi et al., (2002) who observed that moderate ejaculation frequency, produces highly motile sperm cells, resulting in optimum conception in the female. It is therefore, probable that factors such as time of insemination, uterine environment and nutritional deficiencies (Flowers, 2002) were obviated through the beneficial effects of providing adequate resting period in-between ejaculations, hence, the survival of spermatozoa in vitro.
The mean farrowing rate between sows inseminated with semen collected at 24-and 96-h intervals were 56.8 ± 9.11 vs. 85.5 ± 14.3% (P <0.01). Litter size varied significantly (P <0.05) between sows inseminated with semen collected at 24-and 96-h intervals (8 ± 0.02 vs. 12 ± 0.03) and live piglets from the sows inseminated with semen collected at 96-h were 30% higher than those from sows inseminated with semen collected at 24-h intervals. These results, indicating a direct sire effect on fertility and litter size, are in agreement with results reported by Paterson et al. (2002) and Soede et al. (2007).
The South African Journal of Animal Science is available online at http://www.sasas.co.za/sajas.asp
South African Journal of Animal Science 2010, 40 (Issue 5, Supplement 1) © South African Society for Animal Science
Peer-reviewed paper: Proc. 43rd Congress of the South African Society for Animal Science
474
Table 3 Least square means (± s.e.) for effects of frequency of ejaculation at either 24- or 92-h intervals on non-return rate, farrowing rate and litter size in sows
Frequency of ejaculation (h)
No of sows Non-return rate (%) Farrowing rate (%) Litter size (No./litter):
Total piglet Live piglets
24
30 76.8a ± 5.2
56.8a ± 9.1
8a ± 0.02 4a ± 0.1
92
30 93.5b ± 2.9
85.5b ± 14.3
12b ± 0.03 12b ± 0.02
a, b Means with different superscripts in a row are significantly different (P <0.01).
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