Luiz Carlos Cesar da Costa Filho

Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers

The objective of this experiment was to evaluate the effects of replacing eCG with FSH or FSH/LH on the diameter of ovulatory follicles (DOF) and the pregnancy rates (PR) of lactating Bos indicus cows subjected to a synchronization of ovulation protocol and fixed-time artificial insemination (FTAI) based on progesterone, estradiol benzoate (EB), PGF2α, and estradiol cypionate (EC). On day 0, primiparous and multiparous Nellore cows (n = 329) at 68 days postpartum were body condition scored (BCS) and received a P4 implant (PRIMER 1.0 g P4) plus 2 mg EB intramuscularly (IM). At day 8, the implant was removed, and 250 μg cloprostenol were injected IM along with 0.5 mg EC. At the time of implant removal, the animals were divided into one of four treatments: cows received (G1) 1 mL of saline solution IM (Control; n = 80); (G2) 300 IU eCG IM (ECG300; n = 84); (G3) 15 mg FSH IM (Folltropin; n = 82); and (G4) 30 IU FSH/LH IM (Pluset; n = 83); all cows were subjected to FTAI 48-54 h after implant removal (day 10). Transrectal ultrasonography was performed to measure the DOF to FTAI and to estimate the pregnancy rate on day 35. A statistical analysis examined the effects of the treatment, technician, semen, BCS, calf age and parity on PR to FTAI. There was no significant difference in PR and DOF among the treatment groups (G1, 41.3%, 13.1 mm; G2, 46.4%, 14.5 mm; G3, 46.3%, 14.2 mm; and G4, 48.2%, 14.3 mm), but PR was higher in multiparous than in primiparous cows. Commercial FSH solutions (Pluset or Folltropin) do not promote increases in PR or DOF of lactating Nellore cows and are equal to eCG in promoting growth in preovulatory follicles and elevating the PR in Nellore cows with a moderate BCS subjected to a progesterone-based FTAI protocol with EC.

Grupo genético e ordem de parto no desempenho produtivo e reprodutivo de matrizes suínas

The objective of this paper was toevaluate the effect of genetic group (GG) and parity order (PO) of 400 sows on productive and reproductive traits. Were used three GG (GG1, GG2 and GG3) and two PO (PO1 and PO2). The dependent variables evaluated were litter weight at birth (LWB), litter weight at weaning (LWW), litter size at birth (LSB), litter size at weaning (LSW), lactation length (LL), number of litters/female / year (L/F/Y), number of piglets weaned / female / year (P/W/F), daily weight gain of each piglet (DWG), average daily gain of piglets (ADGP), weaning to estrus interval (WEI), average non-productive days (ANP) and number of services per conception (NSPC). The interaction between GG and PO was significant for LWW, LL, L/F/Y, DWG, WEI e ANP. For the other variables (LWB, LSB, LSW and P/W/F) no interaction or effect of GG and PO was observed. There was effect of GG independent of PO in the variables except ADGP and NSPC. The GG 3 was considered superior, since it showed better performance in relation to others in most of characteristics evaluated. It was not possible to determine the best PO, because this varied according to GG and the dependents variables.

Utilização do dispositivo intravaginal de progesterona, em até três usos, para inseminação artificial em tempo fixo de fêmeas "Bos indicus"

Objetivou-se avaliar o efeito do numero de utilizacoes (ate tres) do CIDRO, manifestacao de estro e ordem de paricao sobre a taxa de prenhez em vacas Bos indicus. Utilizou-se 1176 vacas pluriparas e primiparas, lactantes, 30 a 60 dias pos-parto. Os grupos receberam CIDRO de primeiro, segundo ou terceiro usos, mais 2,0 mg de benzoato de estradiol no dia de introducao (D0) e, 500 μg de dinoprost trometamina, 300 UI de eCG e 0,6 mg de cipionato de estradiol na retirada dos dispositivos (D8), com a IATF 48 horas apos (D10). Em 30 dias realizou-se o diagnostico de gestacao (D40). Analisaram-se as variaveis pelo PROC LOGISTIC (SAS) e pela regressao logistica binaria, considerando-se significância quando p 0,1), de 44,8%, 51,1% e 51,1% para CIDRO 1, 2 e 3 usos, respectivamente, bem como a ordem de paricao (pluriparas 50,85% > primiparas 34,48%; p sem estro 33,06%; p<0,01). O CIDRO pode ser utilizado por ate tres vezes, mas as taxas de gestacao mostram-se mais baixas no primeiro uso em relacao ao segundo e terceiro usos e com melhores resultados em pluriparas e com manifestacao de estro.