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61.
研究生态条件和采种期对党参种子产量及其构成因素的影响,可以确定党参种子生产适宜生态区域和采种期。我们以海拔为主区、采收期为副区采取裂区试验设计研究了不同海拔和采种期对党参种子产量及其构成因素的影响。结果表明,当海拔为1 920～2 200 m时党参采种量较高,当海拔2 200 m以上则不利于党参结种;低海拔区域1 922～2 000 m的果实成熟度高,成熟度受采集地生态条件影响明显。党参单株果实数、单株产种量随海拔升高呈增加趋势,当海拔达到2 000 m时党参单株果实数最多,为62.77个;单株产种量最高,为2.25 g。当海拔达到2 000 m、采种期为10月15日时,党参产种量最高,为481 kg/hm2。在高海拔下采种期可以适当提前至10月5日。因此,党参种子生产适宜的海拔区域为2 000～2 200 m范围的生态区,在此海拔下10月中旬是适宜的采种期。 相似文献
62.
Kensuke HIROSE Tatsuya TAKIZAWA Kazuo FUKAWA Tetsuya ITO Masayuki UEDA Yoichi HAYASHI Kazuaki TANAKA 《Animal Science Journal》2011,82(1):46-51
A C?T single nucleotide polymorphism (SNP) on exon 24 of the porcine class 3 phosphoinositide‐3‐kinase (PIK3C3) gene is considered a possible genetic marker for selecting backfat (BF) thickness and carcass fat, although only one study has published results on its effects by performing experiments on a single resource family. We analyzed the association of this PIK3C3 polymorphism with production traits in 739 Duroc pigs. The C allele frequency was 67.9% in our study population. PIK3C3 polymorphism showed significant effects on average daily weight gain (ADG), BF thickness, intermuscular fat content (IMF), and the size of the loin eye muscle area (EMA). The C alleles increased ADG, BF and IMF, and decreased EMA. The predicted differences in traits between the homozygous pigs of the C and T alleles were 40 g/day for DG, 1.2 mm for BF, 0.44% for IMF, and 1.6 cm2 for EMA. Furthermore, the statistical models for estimating the breeding values of each trait had lower Akaike's information criterion values when adding PIK3C3 genotype information. We therefore confirmed that the polymorphism in PIK3C3 (C2604T) has the potential to be a genetic marker for production traits in Duroc pigs. 相似文献
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Satoshi KUSUDA Hisashi HASHIKAWA Masato TAKEDA Hideki ITO Atsushi GOTO Jun OGUCHI Osamu DOI 《The Journal of reproduction and development》2013,59(3):308-313
The purposes of the present study were to clarify age- and season- related androgen
patterns, and to compare the reproductive physiology between Japanese captive koala
populations and Australian populations. To measure fecal androgens, feces were collected
from male koalas (4.2 to 13.8 years of age) kept in Japanese zoos. Fecal androgens were
extracted with methanol from the lyophilized samples and determined by enzyme immunoassay
using 4-androstene-3,17-dione antibody. Fecal androgen concentration in male koalas
increased after sexual maturation and remained relatively high until old age. In the
survey with the Japanese zoo studbook of koalas, copulation (conception) month showed a
pyramid shape with a peak in March to June (60.7%) in koalas born and reared in Japanese
zoos and from July to April with the highest concentration in September to January (69.7%)
in Australian institutes. Japanese zoo koala populations have a characteristic
physiological cycle adapted to Japan''s seasonal changes. The suitable month of year for
copulation or conception in Japan is diametrically opposed to that in Australia. Mean
fecal androgen concentrations by month in the males born and reared in Japan indicated
annual changes with the highest concentration in May and the lowest value in November.
Fecal androgen analysis may be a noninvasive alternative tool to monitor circulating
testosterone and may be helpful in understanding reproductive activity and physiology in
male koalas. 相似文献
68.
Ryoka MIYAKE Takakaki ITO Hiroshi KAMATA Rui KANO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(7):1090
We isolated ascomycetous yeasts including Candida species, that originally belonged to the genus Candida, from bulk milk in the Aichi area of Japan, and determined the minimum inhibitory concentrations (MICs) of antifungal drugs on these isolates by conducting E-tests. We isolated 7 human pathogenic species (14 isolates) from 14 bulk milk samples: 5 Candida species of yeasts, and 2 Candida-related species. Two isolates of C. albicans and C. inconspicua were resistant to fluconazole (MIC >32 mg/l). One isolate of C. krusei was resistant to both azoles (fluconazole: >256 mg/ml and itraconazole: 4 mg/l). One isolate of C. catenulata might be resistant to amphotericin B (>32 mg/l). 相似文献
69.
At fertilization, the sperm triggers resumption from the arrest, extrusion of the second polar body and pronuclear formation, the events of which are collectively acknowledged as ‘oocyte activation’. In all species up to date, oocyte activation requires a fertilization‐associated increase in the intracellular concentration of calcium. Especially in mammals, the signal of intracellular calcium rise at fertilization consists of periodical rises, which are also referred to as calcium oscillations. Our recent results suggest that these calcium oscillations have an important role in not only oocyte activation but also development of mammals. Pigs are animals of great agricultural value and ones in which assisted reproductive techniques, including somatic cell nuclear transfer, to produce gene‐modified pigs. Although reconstructed embryos require artificial activation stimuli which mimic fertilization‐associated increase of intracellular calcium in the oocytes, it has been known that the developmental ability of the oocytes after artificial activation is low and the regimen seems to be required for improvement. Recently we focused on two molecules, phospholipase C zeta and inositol 1,4,5‐triphosphate receptor which have important roles in regulation of calcium oscillations during fertilization in mammals, including pigs. In this review, we will discuss the present status and future perspective of molecular mechanisms during fertilization in pigs. 相似文献
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