สืบค้นงานวิจัย
Effects of Presence of Corpus Luteum at the Beginning of Synchronization of Ovulation on Ovulation Rate and Luteal Characteristics in Dairy Cattle
Nattaphon Chongkasikit - มหาวิทยาลัยเชียงใหม่
ชื่อเรื่อง (EN): Effects of Presence of Corpus Luteum at the Beginning of Synchronization of Ovulation on Ovulation Rate and Luteal Characteristics in Dairy Cattle
ผู้แต่ง / หัวหน้าโครงการ (EN): Nattaphon Chongkasikit
บทคัดย่อ (EN): The objective of this study was to evaluate the effects of presence or absence of a CL at the beginning of the ovulation synchronization program on the ovulation rate and luteal characteristics in dairy cattle. At the beginning of ovulation synchronization program (day 0), ultrasonography determination was used to measure a CL in ovaries and to classify dairy cattle (cows, n=12; heifers, n=15) as the presence (CL+; cows, n=5; heifers, n=5) or absence (CL-; cows, n=7; heifers, n=10) of a CL. Soon after determination, all animals received an intramuscular injection of gonadotropin-releasing hormone (GnRH) and received a progesterone (P4) device. Five days later (day 5) dairy cattle received intramuscular injection of prostaglandin F2 (PGF2) and removed a P4 device. Dairy cattle received a second injection of PGF2 24 h later (day 6). Two days later (day 8) dairy cattle received a second administration of GnRH. Ovaries were scanned daily using transrectal ultrasonography on days 0, 5 and 8. For cows, the presence or absence of a visible CL on ovary did not affect (P>0.05) the incidence of ovulation in response to the first and second GnRH administrations. The proportion of cows having a visible CL at time of first PGF2α injection was less (P<0.05) for CL- than CL+ groups. The average number and size of CL on day 5 were greater (P<0.05) for CL+ than CL- cows. For heifers, the incidence of ovulation in response to the first and second GnRH injections did not differ (P>0.05) between heifers having or not having a CL. Although the percentage of heifers presenting a CL at time of first PGF2 administration did not differ (P>0.05) among CL- and CL+ groups, the average numbers of CL on day 5 were higher (P<0.05) for CL+ than CL- heifers. The average size of CL at time of first PGF2 injection tended (P=0.06) to be greater for CL+ than CL- heifers. In conclusion, the presence or absence of a CL on ovary at the beginning of the short-term progesterone-based ovulation program did not affect ovulation rate of cows and heifers. However, the presence of a visible CL at the beginning of synchronization of ovulation enhanced luteal characteristics by increasing number and size of CL at time of first PGF2α injection in dairy cattle.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): th
เอกสารแนบ: http://journal.agri.cmu.ac.th/content.asp?JID=132&CID=994
เผยแพร่โดย: มหาวิทยาลัยเชียงใหม่
คำสำคัญ (EN): dairy heifers
เจ้าของลิขสิทธิ์: มหาวิทยาลัยเชียงใหม่
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Nattaphon Chongkasikit. "Effects of Presence of Corpus Luteum at the Beginning of Synchronization of Ovulation on Ovulation Rate and Luteal Characteristics in Dairy Cattle". มหาวิทยาลัยเชียงใหม่. 2559

Nattaphon Chongkasikit. "Effects of Presence of Corpus Luteum at the Beginning of Synchronization of Ovulation on Ovulation Rate and Luteal Characteristics in Dairy Cattle". มหาวิทยาลัยเชียงใหม่. 2559. Print.



TARR Wordcloud:
Effects of Presence of Corpus Luteum at the Beginning of Synchronization of Ovulation on Ovulation Rate and Luteal Characteristics in Dairy Cattle
Nattaphon Chongkasikit
มหาวิทยาลัยเชียงใหม่
2559
์Nutrient Requirements of Dairy Cattle in Thailand: Energy requirement of lactating dairy cows Follicular growth, time of ovulation and conception rate after synchronization with medroxy progesterone acetate impregnated sponges in Nili Ravi buffalo heifers (Buffalo Bulletin (Thailand),36(2)) Impact of different estrus induction and ovulation synchronization protocols in addressing infertility in buffaloes (Buffalo Bulletin,39(3)) Efficacy of different protocols of ovulation synchronization and resynchronization in Argentinian buffalo herds (Buffalo Bulletin,38(2)) Effect of per-vaginal insertion of once-used TRIU-B on post-ovulation plasma progesterone and conception rate in buffalo (Buffalo Bulletin,38(2)) Effects of formulation on characteristics of probiotic yogurt enriched by Gac and Passion fruits Effect of Norgestomet Implantation on Synchronization of Oestrus in Beef cattle under Field Condition Effects of an oil spill on the leaf anatomical characteristics of a beach plant (Terminalia catappa L.) Effects of climatic condition on nutritional and physiological responses of yearling Thai native cattle Effects of metabolizable energy intake on growth performance and nutrient digestibility of Thai native cattle
คัดลอก URL
กระทู้ของฉัน
ผลการสืบค้นทั้งหมด โพสต์     เรียงลำดับจาก
พัฒนาระบบโดยศูนย์ความรู้เฉพาะด้านวิศวกรรมความรู้และวิศวกรรมภาษาDeveloped by Center of Excellence for Unified Knowledge and Language Engineering
สนับสนุนโดยสำนักงานพัฒนาการวิจัยการเกษตร (องค์การมหาชน)Supported by the Agricultural Research Development Agency (Public Organization)
แบบสำรวจความพึงพอใจQuestionair