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Mass (TM) and relative mass (organ mass/body mass; RTM) of the right testis and epididymis (EM and REM, respectively) were determined every 14 days from 10 to 122 days of age for intact boars (I) and boars hemicastrated on Day 10 (HC) in two crossbred herds (Trial 1 and Trial 2). Plasma follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin, growth hormone (GH), and testosterone were determined in four blood samples from each pig, three collected 24 h prior to castration and one immediately prior to castration. Values for TM and RTM of HC boars were approximately double (p less than 0.0001) those of I boars by 38 days of age, and these differences were maintained through Day 122. Both EM and REM were greater (p less than 0.05) in HC than in I boars from Day 52 to Day 122. The TM, RTM, EM and REM were greater (p less than 0.05) in Trial 1 than in Trial 2 for both I and HC boars from Day 80 to Day 122, indicating an earlier onset of pubertal testicular growth in the Trial-1 boars. Plasma GH concentration was greater (p less than 0.05) in HC than in I boars from Day 16 to Day 38. A transient increase in plasma FSH (p less than 0.05) was observed from Day 24 to Day 38. After Day 38, there was no difference (p greater than 0.05) in FSH or GH between HC and I boars, or between trials. Plasma LH, prolactin, and testosterone concentrations were also similar in HC and I boars.(ABSTRACT TRUNCATED AT 250 WORDS)

Endocrine Responses in Relation to Compensatory Testicular Growth after Neonatal Hemicastration in Boars1