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Padet TUMMARUK Sawang KESDANGSAKONWUT 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(9):1095-1100
The objective of the present study was to determine the number of ovulations in culled
Landrace × Yorkshire (LY) crossbred gilts in the tropics associated with age, body weight
and growth rate. The genital organs from 316 gilts were examined for gross abnormalities,
and those with normal cyclic ovaries (n=155, 307 ± 4.1 days of age, 148 ± 1.6 kg body
weight) were included in the analyses. Number of ovulations was defined by a count of the
corpora lutea (CL) from both ovaries. On average, the number of ovulations in LY gilts was
15.9 ± 0.3 (range 4 to 27). The number of ovulations correlated with the body weight
(r=0.31, P<0.001) and growth rate (r=0.20, P=0.015)
of the gilts, but not with their age (P>0.05). Gilts with a body
weight of 141 to 150 kg (17.0 CL, n=31) ovulated more than those with a body weight ≤130
kg (14.1 CL, P=0.014, n=23). In conclusion, both the body weight and
growth rate of the gilts were significantly correlated with the number of ovulations. The
maximum number of ovulations was found in gilts at a body weight of above 141 kg. 相似文献
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Chaitawat Sirisereewan Yonlayong Woonwong Jirapat Arunorat Roongtham Kedkovid Teerawut Nedumpun Sawang Kesdangsakonwut Sanipa Suradhat Roongroje Thanawongnuwech Komkrich Teankum 《Tropical animal health and production》2018,50(7):1509-1518
The Chinese highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) has caused a severe threat to the pig population in Southeast Asian countries. The purpose of this study was to investigate the efficacy of a type 2 PRRSV modified live vaccine (PrimePac? PRRS, lineage 7) against a Thai HP-PRRSV (10PL01, lineage 8). Three-week-old PRRSV-free pigs were randomly assigned into three groups. Vaccinated challenged group (group 1, n?=?16) was immunized with PrimePac? PRRS vaccine at 3 weeks old. The unvaccinated challenged group (group 2, n?=?16) was injected with PBS at 3 weeks old, and unvaccinated unchallenged group (group 3, n?=?10) was served as a negative control. At 9 weeks old, all groups, except the negative control group, were challenged with the Thai HP-PRRSV. All pigs were monitored daily during 10 days post-infection (dpi) and were necropsied at 10 and 17 dpi. The results revealed that vaccinated challenged pigs showed significantly lower (p?<?0.05) mean rectal temperatures, clinical respiratory scores, lung lesion scores, and levels of virus load in serum and lung tissue compared with the unvaccinated challenged pigs. Moreover, vaccinated challenged pigs exhibited PRRSV-specific serum neutralizing antibodies at the end of the experiment. Our findings indicated that the studied type 2 PRRSV vaccine provided partial protection against the Thai HP-PRRSV infection based on the body temperature, levels of viremia, and the severity of lung lesions. These results demonstrated that partial protection of PrimePac? PRRS vaccine might be useful for controlling HP-PRRSV infection in the endemic area. 相似文献
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