Maria Inês Lenz Souza

Ovarian response of goats submitted to implants of progesterone followed by administration of equine corionic gonadotrophin

The objective of the present study was to compare the effect of different dosages of equine chorionic gonadotrophin (eCG) on the follicular dynamics and hormonal concentrations in Alpine goats. During the breeding season, the goats were submitted to estrous and ovulation synchronization with a device containing progesterone for 14 days. Female goats (n=24) were divided at random into four groups of 6 animals each. On the day of dispositive removal, the animals received 0 (Control), 200, 300 and 400 UI of eCG. Follicular development was observed by ultrasonography one day prior to administration of eCG until next ovulation. The plasma estradiol (E2) and progesterone (P4) concentrations were daily determined using RIA. All treated animals showed estrous. Estrous cycle with three and four waves of follicular growth were observed. Size of the largest follicle was smaller in control group animals of the third wave (5.5 ± 0.50 mm) when compared to those treated with 300 UI of eCG (7.17 ± 0.35 mm). Gonadotrophin increased the number of small and medium follicles considering the control group because the average number of corpora lutea were higher in 400 UI (4.27 ± 0.23) females than those treated with 200 UI (1.95 ± 0.19). Plasma concentrations of progesterone and stradiol showed differences among experimental groups. Combinations among progesterones and eCG is an adequate alternative for estrus synchronization and support the development of new protocols for reproduction techniques as superovulation and embryo transfer in goats.

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.

Respostas bioquímicas de ovelhas submetidas a flushing de curto prazo em região subtropical

Nutrition influence on animal production is given by changes in weight and body condition, affecting homeostasis, with use of diets with high levels of energy or protein. Changes in the diet cause a rapid and immediate change in various metabolic humoral agents. With the objective to evaluate the influence of five different short-term diets on weight gain and biochemical profile (total cholesterol and fractions HDL/LDL, triglicerydes, glucose, urea, creatinine, total protein, albumin), 70 ewes Santa Ines crossbred, randomly distributed into five groups, were subjected to diets for seven days (1 - corn, soybean meal, protected fat, corn silage, 2 - corn, soybean meal, silage corn, 3 - protected fat, corn silage, 4 -corn silage, 5 - Tifton hay). The days 0 and 8 (before the institution of the diet and after finish) was weighed and blood was obtained from ewes in order to quantify the biochemical profile. Data were analyzed with 5x 2 experimental delineation using two-way ANOVA for repeated measures and Tukey post-test. There were no changes in body weight between diet groups, but became evident variations in weight gain (g / 7 days) between groups (G4 = 1.82 ± 0.23 g versus G1 = 0.21 ± 0.43 g). cholesterol-LDL and total cholesterol varied between groups, with the G1 presented the highest values. The other biochemical component shad no statistically significant differences. Ewes subjected to a flushing program, responded with weight gain, associated with increases in their cholesterol levels and reductions in serum urea.

Live weight and metabolic hormone profile in steers moved in drives

The objective was to determine the effects of driving on the growth of steers during 55 days of moving by drive and 84 days after the arrival. Twenty-five steers were randomly chosen from a herd of 1,000 Nellore cattle, which were evaluated in two periods: the driving period, in which animals were moved a distance of 700 km on foot for 55 d; and the post-driving period, which lasted 84 d. Serum samples were obtained for hormone dosing (T3, T4, cortisol, and IGF-I) by radioimmunoassay using commercial kits. The data was collected at different time points during the experiment. No changes in live weight were observed between days 0 and 55. During the post-driving period, on the 28th, 56th, and 84th d, the average weights were 226.10 kg, 224.28 kg, and 242.6 kg, respectively; differences in weight were observed on the 84th d when compared with the 56th d. There were no changes in insulin and T3 levels in either periods; the lowest T4concentration was observed during the driving period. The serum T4concentration increased after 56 d of post-driving, and it was greater than the concentrations detected on the other days. The highest levels of cortisol were identified after 28 d of post-driving. An increase in IGF-I concentration was observed after 56 and 84 d of post-driving. Moving cattle by driving does not alter the weight of the animals and weight gain occurs during the post-driving period due to an increase in the T4 and IGF-I levels.