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| Registros recuperados: 28 | |
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| MIYAMOTO, Akio; SHIRASUNA, Koumei; HAYASHI, Ken-Go; KAMADA, Daichi; KAWASHIMA, Chiho; KANEKO, Etsushi; ACOSTA, Tomas J.; MATSUI, Motozumi; 宮本, 明夫; 白砂, 孔明; 川島, 千帆; 松井, 基純. |
| Ultrasonography (US) has been applied to the ovary and the uterus of domestic animals from the late 1980s, and established in 1990s as a practical tool for animal production. US made it possible to detect pregnancy at a very early stage and, most importantly, to observe the real-time dynamics of follicular development and hence the discovery of follicular waves. This has greatly contributed to our understanding of ovarian physiology and helped us to develop several "pin-point" protocols for hormonal treatment. While US may not seem to fit preconceived ideas of a "green" technology, it does not contravene environmental priorities, and it is non-invasive ("ethical") and non-hormonal ("clean"). Using the US technology that is now commercially available at a... |
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Palavras-chave: Color Doppler ultrasound; Blood flow; Ovary; Reproduction; Cow. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2983 |
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| KAWASHIMA, Chiho; KIDA, Katsuya; HAYASHI, Ken-Go; AMAYA MONTOYA, Carlos; KANEKO, Etsushi; MATSUNAGA, Nobuyoshi; SHIMIZU, Takashi; MATSUI, Motozumi; MIYAKE, Yoh-Ichi; SCHAMS, Dieter; MIYAMOTO, Akio; 川島, 千帆; 木田, 克弥; 清水, 隆; 松井, 基純; 三宅, 陽一; 宮本, 明夫. |
| The aim of the present study was to investigate the changing profiles of plasma metabolic hormones during the ovarian cycles of beef and dairy cattle. We used 16 non-pregnant, non-lactating Japanese Black beef cattle (6 heifers and 10 cows; parity=2.3 ± 0.8) and 12 multiparous Holstein dairy cows (parity=3.0 ± 0.3). Blood samples for hormonal analysis (growth hormone, GH; insulin-like growth factor-I, IGF-1; insulin; and progesterone, P4) were obtained twice weekly for 40 days before artificial insemination for Japanese Black cattle and from 50 to 100 days postpartum for Holstein cows. Luteal phases were considered normal if the P4 concentrations for at least 3 time points over the course of 7 days remained above 1 ng/ml and at least 2 of the time points... |
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Palavras-chave: Cattle; Insulin-like growth factor-I; Ovarian cycle; Progesterone. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2984 |
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| KAWASHIMA, Chiho; KIDA, Katsuya; MATSUHASHI, Miki; MATSUI, Motozumi; SHIMIZU, Takashi; MATSUNAGA, Nobuyoshi; ISHII, Mitsuo; MIYAKE, Yoh-Ichi; MIYAMOTO, Akio; 川島, 千帆; 木田, 克弥; 松井, 基純; 清水, 隆; 石井, 三都夫; 三宅, 陽一; 宮本, 明夫; 松長, 延吉. |
| The aim of our study was to investigate the effects of suckling on reproductive performance and metabolic status of obese (mean body condition score of more than 4.0 on a scale of 1-5) maternal Japanese Black cows during early postpartum period. We used 7 postpartum Japanese Black cattle. Four cows were suckled ad libitum (suckled) until completion of their first artificial insemination (AI), while 3 cows were not suckled at all because they were separated from their calves immediately after parturition (non-suckled). Body weight and plasma concentrations of metabolites and hormones were measured from wk 1 to 9 postpartum. Ovarian activity was detected using plasma progesterone concentration, and all cows received their first AI after application of the... |
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Palavras-chave: Japanese Black cattle; Metabolic status; Obesity; Reproductive performance; Suckling. |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2991 |
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| KAWASHIMA, Chiho; ITO, Nozomi; NAGASHIMA, Shuntarou; MATSUI, Motozumi; SAWADA, Kumiko; SCHWEIGERT, Florian J.; MIYAMOTO, Akio; KIDA, Katsuya; 川島, 千帆; 松井, 基純; 宮本, 明夫; 木田, 克弥. |
| The aim of the present study was to investigate nutritional and metabolic parameters during the dry and early postpartum periods of ovulatory and anovulatory cows, as well as their postpartum reproductive performance. Blood samples from 20 multiparous Holstein cows were collected once a week from the far-off dry period to 3 weeks postpartum. Early postpartum (0–3 weeks) ovulation was confirmed using plasma progesterone concentration profiles, and cows were considered ovulatory if they had resumed luteal activity by this point (n = 9), whereas cows that had not were considered anovulatory (n = 11). Data from the ovulatory and anovulatory cows were analyzed separately for the far-off dry period (7–4 weeks prepartum), the close-up dry period (3–1 weeks... |
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Palavras-chave: Dairy cow; First ovulation; Hepatic enzyme; Liver function; Reproductive performance. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4308 |
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| KAWASHIMA, Chiho; MATSUI, Motozumi; SHIMIZU, Takashi; KIDA, Katsuya; MIYAMOTO, Akio; 川島, 千帆; 松井, 基純; 清水, 隆; 木田, 克弥; 宮本, 明夫. |
| During recent decades, milk production per cow has increased drastically due to improved management, nutrition, and genetic selection; however, the reproductive performance of high-producing dairy cows has been declining. One of the factors responsible for this low reproductive performance is negative energy balance (NEB). NEB affects the onset of first ovulation in early postpartum cows. It is generally accepted that early first ovulation positively relates to the resumption of normal ovarian function, first service, and conception rate in dairy cows. Hence, delayed first ovulation has a negative impact on subsequent fertility. The metabolic condition of cows in NEB shifts to catabolic metabolism, which in turn causes increased plasma growth hormone and... |
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Palavras-chave: Β-Carotene; Dairy cow; First follicular wave postpartum; First ovulation; Metabolic hormone. |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4041 |
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| Kawashima, Chiho; Fukihara, Saori; Maeda, Mayumi; Kaneko, Etsushi; Montoya, Carlos Amaya; Matsui, Motozumi; Shimizu, Takashi; Matsunaga, Nobuyoshi; Kida, Katsuya; Miyake, Yoichi; Schams, Dieter; Miyamoto, Akio; 川島, 千帆; 松井, 基純; 清水, 隆; 木田, 克弥; 三宅, 陽一; 宮本, 明夫. |
| Recent studies suggest that IGF-I is a crucial regulatory factor in follicular growth during early post-partum period. The aim of the present study was to determine in detail the changing profiles of metabolic and reproductive hormones in relation to ovulation of the dominant follicle (DF) of the first follicular wave post-partum in high-producing dairy cows. Plasma concentrations of related hormones in 22 multiparous Holstein cows were measured from 4 weeks pre-partum to 3 weeks post-partum, and the development of DF was observed with colour Doppler ultrasound. Thirteen cows showed ovulation by 15.2 days post-partum. Anovulatory cows showed higher GH and lower IGF-I levels than those in ovulatory cows during the peri-partum period. Each DF developed... |
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Palavras-chave: GROWTH-FACTOR-I; COMPETITIVE ENZYME-IMMUNOASSAY; ENERGY-BALANCE; OVARIAN ACTIVITY; STIMULATING-HORMONE; ESTRADIOL PRODUCTION; BODY CONDITION; MESSENGER-RNA; HOLSTEIN COWS; IGF-I. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1658 |
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| KAWASHIMA, Chiho; MUNAKATA, Megumi; SHIMIZU, Takashi; MIYAMOTO, Akio; KIDA, Katsuya; MATSUI, Motozumi; 川島, 千帆; 清水, 隆; 宮本, 明夫; 木田, 克弥; 松井, 基純. |
| This study aimed to investigate the effects of insulin resistance (IR) during the close-up dry period on the metabolic status and performance of dairy cows as well as to determine the effects on body weight (BW) and metabolic status of their calves. An insulin tolerance test (ITT) was conducted by administering 0.05 IU/kg BW of insulin to 34 multiparous Holstein cows at 3 weeks prepartum. Blood samples were collected at 0, 30, 45 and 60 min after insulin injection, and cows were divided into two groups based on the time required for glucose to reach the minimum levels [non-IR (NIR), 45 min (n=28); and IR, 60 min (n=6)]. Blood or milk sampling and body condition score (BCS) estimation were performed twice weekly during the experimental period. Blood samples... |
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Palavras-chave: Dairy cow; Dry period; Insulin tolerance test; Metabolic status; Postpartum performance. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4363 |
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| KAWASHIMA, Chiho; KANEKO, Etsushi; AMAYA MONTOYA, Carlos; MATSUI, Motozumi; YAMAGISHI, Norio; MATSUNAGA, Nobuyoshi; ISHII, Mitsuo; KIDA, Katsuya; MIYAKE, Yoichi; MIYAMOTO, Akio; 川島, 千帆; 松井, 基純; 石井, 三都夫; 木田, 克弥; 三宅, 陽一; 宮本, 明夫. |
| The aim of this study was to investigate the relationship between the first ovulation within 3 weeks postpartum and subsequent ovarian cycles and fertility in high producing dairy cattle in Hokkaido, Japan. In Experiment 1, 110 cows (44 primiparous and 66 multiparous) were used to determine the effects of the first ovulation within 3 weeks postpartum on subsequent ovarian cycles. Milk samples were collected twice weekly from 7 to 100 days postpartum. The first ovulation was identified by an increase in milk progesterone (P4) to more than 1 ng/ml within 3 weeks postpartum. The numbers of cows showing ovulation and anovulation within 3 weeks postpartum were 31 (70.5%) and 13 (29.5%) in the primiparous cows and 35 (53.0%) and 31 (47.0%) in the multiparous... |
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Palavras-chave: Dairy cow; First ovulation; Postpartum; Resumption of ovarian cycle. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/916 |
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| SHIRASUNA, Koumei; KAWASHIMA, Chiho; MURAYAMA, Chiaki; AOKI, Yuka; MASUDA, Yutaka; KIDA, Katsuya; MATSUI, Motozumi; SHIMIZU, Takashi; MIYAMOTO, Akio; 白砂, 孔明; 川島, 千帆; 増田, 豊; 木田, 克弥; 松井, 基純; 清水, 隆; 宮本, 明夫. |
| The decrease in fertility and conception rates of high-producing dairy cows is one of the major negative impacts for today's producers. The recovery of ovarian activity postpartum is affected by the status of immunity, metabolism and reproduction and plays a critical role in subsequent fertility after parturition in the cow. In the present study we investigated the relationships between polymorphisms in genes relating to the above functions and the first postpartum ovulation as a marker of the recovery of ovarian function in the cow. In immune function related-factors, the occurrence of first postpartum ovulation within 3 weeks in the C/C genotypes of tumor necrosis factor α (TNFα) exon (55.4%) and the A/G genotypes of TNFα promoter (55.4%) was... |
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Palavras-chave: Cow; Ovulation; Polymorphism; Tumor necrosis factor α (TNFα). |
| Ano: 2011 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2990 |
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| LEE, Hsu-Hsun; KIDA, Katsuya; MIURA, Ryotaro; INOKUMA, Hisashi; MIYAMOTO, Akio; KAWASHIMA, Chiho; HANEDA, Shingo; MIYAKE, Yoh-Ichi; MATSUI, Motozumi; 猪熊, 壽; 宮本, 明夫; 川島, 千帆; 羽田, 真悟; 松井, 基純. |
| In peripartum dairy cows, insulin resistance (IR) increases to adjust the direction of energy to lactation after calving. To investigate the effect of prepartum IR on postpartum reproductive performance, the insulin tolerance test (ITT) was applied to 15 cows at 3 weeks (Pre21) and 10 days (Pre10) before the predicted calving date. Blood glucose area under the curve (AUCglu) within 120 min after administration of 0.05 IU/kg-BW insulin was calculated. The occurrence of first ovulation, days to first artificial insemination (AI) and first AI conception rate were recorded. Nutritional status postpartum was evaluated by blood chemical analysis. Based on AUCglu changes from Pre21 to Pre10, cows were classified into either the AUC-up group (AUCglu increase, n=5)... |
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Palavras-chave: Dairy cows; Glucose metabolism; Insulin tolerance test; Reproductive performance; Transition period. |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4129 |
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| 川島, 千帆; 木村, 文香; 花田, 正明; 河合, 正人; 岡本, 明治; KAWASHlMA, Chiho; KIMURA, Ayaka; HANADA, Masaaki; KAWAI, Masahito; OKAMOTO, Meiji. |
| The objective was to evaluate the effect of the ratio of degradable intake protein (DIP) to non-structural carbohydrate (NSC) on the nitrogen flows to duodenum of steers by replacement alfalfa silage with corn silage. Six Holstein steers fitted with ruminal and duodenal cannulae were divided into two 3 x 3 Latin squares with 20d periods. In the first Latin squareï¼ the steers were fed three diets contained (dry matter basis): 1) 100% alfalfa silage (AS100)ï¼ 2) 80% alfalfa silageï¼ 20% corn silage (AS80)ï¼ or 3) 60% alfalfa silageï¼ 40% corn silage (AS60). In the another Latin squareï¼ the steers were fed three diets contained (dry matter basis): 1) 40% alfalfa silageï¼ 60% corn silage (AS40)ï¼ 2) 20% alfalfa silageï¼ 80% corn silage (AS20) or 100% corn... |
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Palavras-chave: アルファルファサイレージ; コーンサイレージ; 分解性タンパク質; 非構造性炭水化物; 十二指腸への窒素移行量; Alfalfa silage; Corn silage; Degradable intake protein; Non-structural carbohydrate; Doudenal nitrogen flows. |
| Ano: 2001 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3010 |
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| Registros recuperados: 28 | |
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