Relationships between numbers of antral follicles and postpartum interval in Brahman females
| Autor: | Lacey Quail, Thomas H. Welsh, J. P. Banta, Don A Neuendorff, M E Mund, Ronald D. Randel |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Time Factors Pregnancy Rate Brahman Ovary Breeding Biology 03 medical and health sciences Animal science Estrus Ovarian Follicle Food Animals Pregnancy medicine Animals Small Animals Estrous cycle Equine business.industry Postpartum Period 0402 animal and dairy science 04 agricultural and veterinary sciences Antral follicle 040201 dairy & animal science 030104 developmental biology medicine.anatomical_structure Cattle Female Animal Science and Zoology Ultrasonography business |
| Zdroj: | Theriogenology. 121:1-6 |
| ISSN: | 0093-691X |
| Popis: | To determine relationships of ovarian antral follicle count (AFC) on d 28 postpartum with postpartum interval (PPI) and AFC on d 8 post-estrus, three-dimensional ultrasonography was performed on multiparous (n = 47) and primiparous (n = 20) Brahman cows on d 28 postpartum and on d 8 post-estrus. Follicles were evaluated to determine numbers of total, small (≤17 mm3), medium (17 mm3–67 mm3), and large follicles (≥67 mm3) on each ovary. Estrus was detected using vasectomized, penile-deviated bulls fitted with chin-ball markers during the AI period and with tail paint during the natural service period. Cows with AFC ≥ ½ SD above the mean were classified as high, those within ½ SD of the mean were classified as intermediate, and those ≥ ½ SD below the mean were classified as low. Classes of AFC for total follicles included low (L ≤ 73), intermediate (74 ≤ I ≤ 112), and high (H ≥ 113). Classes of AFC for small follicles included low (L ≤ 55), intermediate (56 ≤ I ≤ 87), and high (H ≥ 88). Classes of AFC for medium follicles included low (L ≤ 13), intermediate (14 ≤ I ≤ 23), and high (H ≥ 24). Classes of AFC for large follicles included low (L ≤ 2), intermediate (3 ≤ I ≤ 4), and high (H ≥ 5). Cows with PPI ≥ ½ SD above the mean were classified as long, those within ½ SD of the mean were classified as intermediate, and those ≥ ½ SD below the mean were classified as short. Classes of PPI included short (S ≤ 47 d), intermediate (48 d ≤ I ≤ 75 d), and long (L ≥ 76 d). The PROC MIXED procedure of SAS was used to analyze potential differences among classes of AFC and PPI. The PROC REG procedure of SAS was used to analyze relationships between AFC and PPI and between AFC on d 28 postpartum and on d 8 post-estrus. The PPI differed among classes of total (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect