How to Improve Reproductive Efficacy from Now in Japan? : Find out the Factors of Late Lactation to Predict Postpartum Reproductive Diseases
スポンサーリンク
概要
- 論文の詳細を見る
Reproductive efficiency and performance in dairy cattle has been declining over the last 20 years in Japan. Recently, this has resulted in serious problems in dairy herds. There have been changes in the animals themselves and in the animals environment, e.g. the genetic potential for milk yield has improved, the herd size of dairy farms has been expanding, the housing system of dairy cattle has been changing from tie stall to free stall, and total mixed ratio (TMR) feeding systems have become widespread. It is not clear whether the animals have adapted adequately to these environmental changes. Up till now, reproductive management has been undertaken by monitoring animal performance and/or hormonal treatments, and this has resulted in acceptable reproductive performance. However, conception and pregnancy rates have continued to decline, and the calving to calving interval has continued to extend. Consequently, the average parity and the average age at culling in dairy cattle have been declining. The most common causes of culling in dairy cattle are reproductive disorders in Japan. Therefore, in future, prevention of reproductive disorders will be required for both reproductive efficiency and animal welfare. During late pregnancy and the transition from the pregnant, non-lactating state to the non-pregnant, lactating state, dramatic changes are occurring in the dam including an increase in the fetal-placental mass and calving. Thus, the demand for energy, protein and minerals by the conceptus increases, the space within the abdominal cavity and the rumen capacity decreases due to the increased volume of the conceptus, the local immunological relationship between the fetal and maternal placenta dramatically changes, and physiological homeostasis is activated to adapt to these changes. If cattle cant maintain homeostasis before calving, the incidence of reproductive diseases will be greatly increased. We have been examining reproductive, nutritional and immunological factors to predict the occurrence of reproductive disorders as early as possible and to develop strategies to prevent them. It is unlikely that all dairy farms in Japan will be able to improve reproductive performance with general advice, due to the wide variation in feeding systems and management in Japan. Therefore, specific advice needs to be tailored to each herd, based on management systems employed within each herd. We have proposed that it is important to identify common risk factors across herds, to use these factors as an index for disease control and reproductive management and finally to demonstrate the relationship between these factors and fundamental improvement of the reproductive efficiency. We propose this approach with the aim of providing a breakthrough in improving reproductive performance in dairy cattle in Japan. The focus of this review will be that such an approach is important for improvement of the reproductive efficiency in Japanese dairy cows.
- 日本繁殖生物学会の論文
- 2006-02-01
著者
-
Nakada Ken
Department Of Large Animal Clinical Sciences School Of Veterinary Medicine Rakuno Gakuen University
-
Nakada Ken
Department Of Large Animal Clinical Sciences Graduate School Of Veterinary Medicine Rakuno Gakuen Un
関連論文
- 春機発動前の雌ウシにおけるGnRH投与後の末梢血中黄体形成ホルモンおよび卵胞刺激ホルモン濃度の変化
- 難産、胎盤停滞、およびボディコンディションが周産期乳牛の血漿中ベータエンドルフィン動態に及ぼす影響
- 乳牛の妊娠期における栄養状態が新生子の生時体重と活力ならびに胎盤の排出時間に及ぼす影響
- 乳牛の卵巣静止に対するプロジェステロン放出窒挿入剤投与の安全性と治療効果
- Change in Morphology of Spermatozoa from Dismount Semen during the Breeding Season in Thoroughbred Stallions in Japan
- Estrone Sulfate Concentrations, Calf Birth Weight and Viability, and Placental Weight and Expulsion in Dairy Cattle with Different Gestation Length
- Estrone Sulfate Concentrations, Calf Birth Weight and Viability, and Placental Weight and Expulsion in Dairy Cattle with Different Gestation Length
- ACTHにより誘発した卵胞嚢腫牛のエストラジオールに対するLH分泌反応の欠如
- ホルスタイン種乳牛における母体血漿中プロジェステロンおよびエストロンサルフェート濃度と難産との関係
- Effect of CIDR Treatment at Day 16 of Estrous Cycle on Follicular Growth in Dairy Heifers with Two or Three Follicular Waves
- How to Improve Reproductive Efficacy from Now in Japan? : Find out the Factors of Late Lactation to Predict Postpartum Reproductive Diseases
- Initiation, Persistence, and Cessation of the Series of Intracellular Ca2+ Responses during Fertilization of Bovine Eggs
- Clinical Response of Inactive Ovaries in Dairy Cattle after PRID Treatment
- Initiation, Persistence, and Cessation of the Series of Intracellular Ca^ Responses during Fertilization of Bovine Eggs
- Early Pregnancy Diagnosis in the Sow by Fecal Gestagen Measurement Using a Bovine Milk Progesterone Qualitative Test EIA Kit
- Stress and Uterine Bacterial Flora in Diary Cows Following Clinically Normal and Abnormal Puerperium
- Pituitary Chromophobe Carcinoma with a low Level of Serum Gonadotropin and an Aspermatogenesis in a Dog
- Radioimmunoassay of Saliva Estrone Sulfate in Pregnant Sows.
- Postpartum Plasma PGF Metabolite Profile in Cows with Dystocia and/or Retained Placenta, and Effect of Fenprostalene on Uterine Involution and Reproductive Performance.