 |
|
|
|
 |
|
 Researcherดร. จำเริญ เที่ยงธรรม, รองศาสตราจารย์ที่ทำงาน:ภาควิชาสัตวบาล คณะเกษตร สาขาที่สนใจ:สรีรวิทยาและระบบฮอร์โมนการสืบพันธุ์ของสัตว์, สรีรวิทยาสิ่งแวดล้อม, การจัดการผสมพันธุ์โค-สุกรคุณภาพน้ำเชื้อและการผสมเทียมโค-สุกร, สรีรวิทยาการผลิตสัตว์ Resume |
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Vaginal Electrical Resistance and Size of Dominant Follicle in Beef Cows Subjected to Synchronization of Ovulation Protocol) ผู้เขียน: Million Tadesse,  ดร.จำเริญ เที่ยงธรรม, รองศาสตราจารย์, ดร.อนุชัย ภิญโญภูมิมินทร์, รองศาสตราจารย์ , ดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe objectives were to determine the efficiency of vaginal electrical resistance (VER) to indicate synchronization success and its correlation with the diameter of the largest follicle (DLF). Crossbred beef cows with more than two lactations from the beef farm at the Kamphaeng Saen campus, Kasetsart University were synchronized with the Co-Synch plus controlled internal drug release (CIDR) protocol that consisted of a CIDR insert and an intramuscular injection of gonadotropin-releasing hormone (GnRH; first GnRH; 2 mL) on Day 0, removal of the CIDR insert and an injection of Prostaglandin F2 alfa (PGF2?; 2 mL) on day 7 and a second injection of GnRH (2 mL) at 48 or 66 h after PGF2? injection. VER was determined with an Ovatec device at Days 0, 7 and at the time of the second GnRH injection. Trans-rectal ultrasonography was performed on the same day to assess ovarian follicular development. The DLF (mean ? SE) was highest (16.3 ? 0.5 mm; P < 0.05) at the second GnRH injection and lowest at Day 0 (9.8 ? 1.0 mm). The VER (mean ? SE; measured in ohms ?) was significantly highest (93.8 ? 1.7 ?; P < 0.05) on Day 0 and lowest (79.1 ? 1.7 ?) at the time of second GnRH injection. Mean VER was inversely correlated (r = -0.49; P < 0.05) with DLF at the second GnRH injection. The significant correlation obtained between VER and DLF indicated that VER can be used to predict the stage of follicular maturity and the response to synchronization treatment. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Use of Vaginal Electrical Resistance to Diagnose Estrus and Early Pregnancy and Its Relation with Size of the Dominant Follicle in Dairy Cattle) ผู้เขียน:Million Tadesse, ดร.จำเริญ เที่ยงธรรม, รองศาสตราจารย์, ดร.อนุชัย ภิญโญภูมิมินทร์, รองศาสตราจารย์, ดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์, Azage Tegegne สื่อสิ่งพิมพ์:pdf AbstractThe use of vaginal electrical resistance (VER) for estrous detection and early pregnancy diagnosis were evaluated using three experiments in dairy cattle, in Ethiopia. VER was measured: 1) during the natural estrous (n = 60) cycle, 2) during estrus induced by GnRH+ PGF2? (n = 11) and 3) during post insemination in dairy cows synchronized with GnRH+CIDR+PGF2? (n = 25). Results from Experiment 1 indicated that VER (mean ? SD) during pro-estrus, estrus, metestrus, diestrus and anestrous was 89.6 ? 3.1, 82.2 ? 2.2 102.9 ? 3.1, 106.8 ? 1.4 and 119.7 ? 1.7 ohm, respectively. Results from Experiment 2 indicated that VER was highest (102.4 ? 2.0 ohm; P < 0.001) at the time of PGF2? injection and significantly declined to 82.3 ? 0.7 ohm at the time of estrus and increased (94.9 ? 2.0 ohm; P < 0.001) 24 h after estrus. The mean diameter of the largest follicle (DLF) was highest (14.3 ? 0.1 mm; P < 0.001) at estrus and lowest (10.0 ? 0.1) at the time of PGF2? injection. The VER value was inversely correlated (r = -0.50; P < 0.001) with DLF. Results from Experiment 3 showed that VER significantly (P < 0.01) declined from day 19 to day 21 post insemination in non pregnant cows compared with pregnant cows. The study proved that VER can effectively be used for estrus detection and can be used to diagnose early pregnancy (day 18–21 post insemination) in dairy cows. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Estrus Performance of Boran and Boran ? Holstein Friesian Crossbred Cattle Synchronized with a Protocol based on Estradiol Benzoate or Gonadotrophin-Releasing Hormone) ผู้เขียน:Million Tadesse, ดร.จำเริญ เที่ยงธรรม, รองศาสตราจารย์, ดร.อนุชัย ภิญโญภูมิมินทร์, รองศาสตราจารย์, ดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์, Azage Tegegne สื่อสิ่งพิมพ์:pdf AbstractThe objectives of this study were to determine estrus behavior, interval to estrus, duration of estrus and time of ovulation of Boran, and Boran ? Holstein Friesian (HF) breeds. A total of 113 cows and heifers from the two breeds were synchronized with two estrus synchronization protocols: 1) estradiol benzoate (EB) + controlled internal drug release (CIDR) + prostaglandin (PGF2?); and 2) gonadotrophin (GnRH) + CIDR + PGF2?. The results (mean ? SE) showed that the Boran breed had significantly longer interval to estrus (70.67 ? 5.9 versus 54.58 ? 4 h), shorter duration of estrus (8.65 ? 0.83 versus 12.1 ? 0.7 h) and lower behavioral score (mean ? SD; 883 ? 639 versus 3,399 ? 957) compared to Boran ? HF crossbred cattle. Animals treated with EB + CIDR + PGF2? had a significantly shorter interval to estrus (46.75 ? 4 versus 78.5 ? 4 h), higher behavioral score (3,058 ? 1,223 versus 2,663 ? 991) and longer duration of estrus (11.31 ? 0.71 versus 9.4 ? 0.75 h) compared to animals treated with GnRH + CIDR + PGF2?. The interval from estrus to ovulation (26 ? 2.5 h) was not different between breeds and between synchronization methods. The Boran (Bos indicus) breed tended to have a longer interval to estrus, shorter duration of estrus and an estrus behavior score lower than Boran ? HF crossbred cattle treated and managed under similar conditions. The protocol using EB + CIDR + PGF2? was more effective than GnRH + CIDR + PGF2? in terms of enhancing estrus behavior and creating tight synchrony. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Dry Season Cutting Management on Subsequent Forage Yield and Quality of Ruzi (Brachiaria ruziziensis) and Dwarf Napier (Pennisetum purpureum L.) in Thailand) ผู้เขียน:Tadesse Tekletsadik, ดร.สายัณห์ ทัดศรี, ศาสตราจารย์ , นางสุนันทา จันทกูล, ผู้ช่วยศาสตราจารย์ , ดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA field study was conducted under rainfed conditions during 2002 – 2003 to determine the effect of dry season cutting management on the yield and quality of ruzi (Brachiaria ruziziensis) and dwarf napier (Pennisetum purpureum) grass during the dry season and the following wet season. The pastures were cut 1, 3, 6 times during the dry season and 7 times during the following wet season at 5 and 20 cms above ground level. The study was sited on a reddish brown sandy clay loam soil at Suwanvajokkasikit Field Crop Research Station in the Pakchong district of northeast Thailand. During both dry and wet seasons, leaf production and total plant production of dwarf napier were noticeably higher than ruzi grass but similar in stem production. Lax cutting (20 cm) produced significantly higher yield than close cutting (5 cm) and cutting every 2 months (3 times) tended to give higher yields than cutting more and less frequently of dwarf napier grass but not of ruzi. However, in the following wet season the pastures cut only once during the dry season produced significantly higher yields of herbage than those defoliation more frequently, particularly in the case of dwarf napier. The protein percentage in dwarf napier and ruzi grass was not significantly different, although tended to be higher in dwarf napier particularly during the wet season and in the stem fraction. Protein yields, however, between the two grasses were highly significant with dwarf napier yield being much higher than ruzi, which was largely a reflection of the respective dry matter yields. Both pasture species showed higher protein yields under lax cutting than close cutting in both seasons. Lax cutting also tended to produce higher neutral detergent fiber (NDF) and acid detergent fiber (ADF) content in the total herbage than close cutting and in both seasons. NDF and ADF concentration significantly increased with delayed time of cutting in the dry season. |
|