02727naa a2200409 a 450000100080000000500110000800800410001902400420006010000220010224501280012426000090025252015760026165000240183765000110186165000180187265000180189065000270190865000100193565000170194565000280196265000190199065000140200965000170202365000240204065300110206465300210207565300100209665300090210665300170211565300080213265300140214065300190215465300380217365300160221170000210222777300690224816636992019-09-25       2005    bl uuuu     u00u1 u    #d7 a10.1111/j.1439-0531.2005.00612.x2DOI1 aFONSECA, J. F. da  aAdministration of hCG 5 days after breeding and reproductive performance in nulliparous dairy goats.h[electronic resource]  c2005  aAbstract: The objective of this study was to investigate the effect of hCG administration 5 days after breeding on plasma progesterone (P4) concentration and reproductive performance of oestrousinduced nulliparous dairy goats. A total of 59 nulliparous goats (36 Alpine and 23 Saanen) received intravaginal sponges with 60 mg medroxyprogesterone acetate for 9 days plus 200 IU equine chorionic gonadotrophin (eCG) and 22.5 lg d-cloprostenol 24 h before sponge removal. After detection of oestrus (day of oestrus ¼ day 0) and breeding, 49 females were randomly assigned, according to the breed, into two treatments (T1 and T2). In T1 (n ¼ 25) and T2 (n ¼ 24), animals received intramuscular injection of 1 ml of saline solution (control) or 250 IU hCG, respectively, 5 days after breeding. Plasma P4 concentration (ng/ml) was determined from blood sampled on days 0, 5, 7, 13, 17, 21, 28 and 45 after breeding. Animals were scanned by transrectal ultrasound (5 MHz probe) on days 35 and 70 after breeding for detection of pregnancy. Plasma P4 concentration did not differ (p &gt 0.05) between treatments in all days, but it was increased (p &lt 0.05) in Saanen than in Alpine goats from days 13 to 45. Pregnancy and parturition rates, litter size and gestation period were similar (p &gt 0.05) to treatments and breeds. Results of this study indicate that human chorionic gonadotrophin (hCG) administration 5 days after breeding did not significantly alter reproductive performance in dairy nulliparous goats and that plasma P4 differed between Saanen and Alpine goats.  aAnimal reproduction  aBrazil  aCorpus luteum  aEstrous cycle  aEstrus synchronization  aCabra  aCiclo estral  aEficiência reprodutiva  aEndocrinologia  aIndução  aProgesterona  aReprodução animal  aBrasil  aCaprino leiteiro  aEstro  aGoat  aGonadotropin  aHCG  aInduction  aOestrous cycle  aPlasma progesterone concentration  aProgestagen1 aTORRES, C. A. A.  tReproduction in Domestic Animalsgv. 40, n. 6, p. 495-499, 2005.