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Follicular dynamics during the oestrous cycle in dairy goats

Published online by Cambridge University Press:  18 August 2016

A. Gonzalez de Bulnes ,
J. Santiago Moreno ,
A. Gomez-Brunet ,
E. K. Inskeep ,
E. C. Townsend  and
A. Lopez-Sebastian
A. Gonzalez de Bulnes
Affiliation:
Area de Reproducción Animal, INIA, Avda Puerta de Hierro Km 5.9, 28040 Madrid, Spain
J. Santiago Moreno
Affiliation:
Area de Reproducción Animal, INIA, Avda Puerta de Hierro Km 5.9, 28040 Madrid, Spain
A. Gomez-Brunet
Affiliation:
Area de Reproducción Animal, INIA, Avda Puerta de Hierro Km 5.9, 28040 Madrid, Spain
E. K. Inskeep
Affiliation:
Division of Animal and Veterinary ScienceWest Virginia University, Morgantown WV26506-6108, USA
E. C. Townsend
Affiliation:
Department of Statistics, West Virginia University, Morgantown WV26506-6108, USA
A. Lopez-Sebastian
Affiliation:
Area de Reproducción Animal, INIA, Avda Puerta de Hierro Km 5.9, 28040 Madrid, Spain
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Abstract

Development of all follicles with antral diameter ≥2 mm during the oestrous cycle was characterized in goats of the Murciana-Granadina dairy breed by daily transrectal ultrasonography. Of nine does initially synchronized in oestrus, six returned to oestrus and three did not. In the first six does, mean cycle length was 21·2 (s.e. 2-3) days. There were mean total numbers of 6·2 (s.e. 0·6) small (2 to 3 mm), 1·9 (s.e. 0·3) medium (4 to 5 mm), and 1·0 (s.e. 0·2) large follicles (≥6 mm) each day but only numbers of large follicles differed with day of cycle (P < 0·01). The diameters of the largest follicle (LF1), the second largest (LF2) and the remaining follicles (RF) varied with day of cycle (P < 0·01). The LF1 and LF2 varied with day in similar patterns but the difference in diameter between them (P < 0·05) was greatest on days 7 and 9 (2·3 mm) and days 19 to 23 (2·2 to 3·8 mm), and least on days 2, 15, 16 and 18 (0·5 to 0·8 mm). The relationship between the LF1 and LF2 to the RF differed only early or late in the cycle when concentrations of progesterone were low (P < 0.05). There was some evidence to support follicular growth in waves. Although the number of apparently new follicles detected (4·8 (s.e. 0·4) per day) did not vary with day of cycle, follicles emerging at 3 mm over a 48-h period that grew to a diameter of ≥6 mm were distributed non-randomly in three of six cyclic does. The three cystic does that did not return to oestrus by day 25 had large follicles (16 to 28 mm), fewer new follicles (3·3 (s.e. 1-1) per day; P < 0·01) than cyclic does (4·8 (s.e. 0·4) per day) and fewer follicles that became largest (4·0 v. 8·8 in cyclic does; P < 0·01).

Keywords

folliclesgoatsoestrous cycleovariesultrasonography
Type
Research Article
Information
Animal Science , Volume 68 , Issue 3 , April 1999 , pp. 547 - 554
Copyright
Copyright © British Society of Animal Science 1999

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