02409naa a2200361 a 450000100080000000500110000800800410001910000200006024501820008026000090026252013860027165000180165765000180167565000100169365000180170365000130172165000240173465000370175865000170179565000120181265000170182465000120184165000170185365000140187065000170188465300100190165300180191165300070192965300080193670000190194470000180196377300660198115209282023-11-06       1943    bl uuuu     u00u1 u    #d1 aPHILLIPS, R. W.  aObservations on the normal estrous cycle and breeding season in goats and possibilities of modification of the breeding season with gonadotropic hormones.h[electronic resource]  c1943  aAbstract: Observations on 87 [female] Toggenburg and Saanen goats in the herd at the Belts-ville Research Center, Beltsville, Md., and records on 300 [female] [female] listed by the American Milk Goat Record Association indicate that most does will come in estrus regularly between about the middle of Sept. and the middle of Dec. Some does continue to come in estrus through Feb. and Mar., but only an occasional doe exhibits estrus in the late spring and summer months. The season during which most does can be bred with reasonable certainty appears to be limited to about 3 months in the fall. Observations on 161 estrous cycles showed that the average length of the cycle was 22.8 and 23 days in dry and milking does, respectively, and 16.6 days in kids. There was considerable variation, however, and the greatest number of cycles fell between 18 and 24 days. A considerable group also fell between 2 and 12 days. Some long cycles occurred which appeared to be multiples of the most frequently observed length. Preliminary work with 20 does indicates that there is some possibility of stimulating the ovaries with gonadotropic hormones (P.M.S. and L.H.) outside the usual breeding season, thereby making it possible to provide a more uniform milk supply throughout the year. Further work is needed to develop a procedure that can be used with reasonable certainty in practice.  aEndocrinology  aEstrous cycle  aGoats  aGonadotropins  aHormones  aLuteinizing hormone  aPregnant mare serum gonadotropin  aReproduction  aSeasons  aAcasalamento  aCaprino  aCiclo Estral  aHormônio  aReprodução  aEpoca  aGonadatrofina  aLH  aPMS1 aSIMMONS, V. L.1 aSCHOTT, R. G.  tAmerican Journal Veterinary Researchgv. 4, p. 360-367, 1943.