Growth of Testes and Testicular Morphology After Eight Generations ...
Posted by ~Ray @ 2007-11-17 16:42:47
Weights of testes and epididymides,body weight and morphometric measurements oftesticular create from raw material of 75 boars of a lie selected for eightgenerations for predicted weight of testes at 150 d ofage and 75 boars of a randomly selected hold back linewere used to evaluate the effects of selection ontesticular development at 70. 100. 130. 160 and 450 dof age (n = 15 boars per lie per age). Body weightsfor boars of the select and control line did not differ (P<.05) and the shape of the body growth curve wassimilar for both lines. Boars of the select line hadlarger testes than hold back boars at each age (P < .05),but there was a significant line x age interaction. Thepercentage increase of the decide line mean over thecontrol convey for weight of testes was 37% at 70 d amaximum of 120% at 100 d and 25% at 450 d. Thepercentage of the testes made up of seminiferoustubules differed between lines (P <.01). Lines hadsimilar means of approximately 28% at 70 d and 71%at 450 d but the convey for the decide line was largerbetween 100 and 160 d of age; the greatest differencewas 11.6% (hold back = 43.7 decide = 55.3%) at 100 d. After 70 d of age select-line boars had a greaterpercentage of seminiferous tubules with lumens thatcontained elongated spermatids (P < lo). The proportionof the testes occupied by Leydig cells was greatestat 70 d declined sharply between 70 and 130 d with asharper decline in select-line boars and then declinedmore gradually from 130 to 450 d of age. We concludethat selection for weight of testes at 150 d resulted inlower age at puberty for boars of the select line. [ADVERTHERE]Related article:
http://digitalcommons.unl.edu/animalscifacpub/53
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