Follicular development and expression of the messenger ribonucleic acid for the inhibin/activin subunits in two genetic lines of turkey hens that differ in total egg production.

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Abstract	ABSTRACT The characterization of the follicular hier- displayed a more distinct follicular size hierarchy than archy and the expression of the mRNA for the inhibin/ activin subunits was investigated in the follicles of 2 lines of turkey hens selected for over 40 generations for in-Growth line hens at 45 and 58 wk. Although total follicular weight relative to body size was greater at 45 and 58 wk of age for the Egg line hens than the Growth line creased egg production (Egg line) or increased body hens, the total number of hierarchical follicles was greater weight (Growth line). The follicular hierarchies of 6 hens in the Growth line hens at 45 and 58 wk of age. Expression from the Egg and Growth lines were characterized in of follistatin and the inhibin βB-subunit was highest in nonhierarchical follicles, whereas the expression of the middle (45 wk of age) and late production (58 wk of age). inhibin α- and β Relative follicular weights for individual hierarchical fol-A-subunits was highest in the hierarchical follicles. The inhibin α- and βA-subunit mRNA expression licles (>12 mm), pooled small yellow follicles (5 to 12 pattern in the 4 largest follicles of the Growth line hens mm), and large white follicles (2 to 5 mm) were calculated. was not similar to the Egg line hens or characteristic of Total RNA was extracted for Northern blot analysis from laying hens that have a high rate of egg production. The individual granulosa cell layers of the F1 through F4 folli- unusual inhibin subunit mRNA expression in the largest cles, and from the combined granulosa and theca layers of small yellow follicles and large white follicles from an additional 6 hens from each genetic line. Egg line hens hierarchical follicles of the Growth line hens may account for their development of an abnormal follicular size hierarchy and for their poor egg production.
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Subject Keyword	Inhibin Activin Subunit Turkey Hen Growth Line Genetic Line Hierarchical Follicle Total Egg Production Follicular Development Messenger Ribonucleic Acid Large White Follicle Growth Line Hen Egg Production Egg Line Egg Line Hen Small Yellow Follicle Body Hen Follicular Hier High Rate Theca Layer A-subunit Mrna Expression Licles Relative Follicular Weight Abnormal Follicular Size Hierarchy Follicular Hierarchy Unusual Inhibin Subunit Mrna Expression Total Rna Poor Egg Production Distinct Follicular Size Hierarchy Total Number In-growth Line Hen Northern Blot Analysis Individual Hierarchical Fol-a-subunits Total Follicular Weight Relative Body Size Late Production Individual Granulosa Cell Layer Nonhierarchical Follicle Inhibin B-subunit
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