The study was conducted with the objective of evaluate different types and volumes of diluents through the reproductive performance of 72 artificially inseminated sows. A randomized complete design was used in a 3 × 2 factorial arrangement, with three diluents and two semen volumes. The semen used was obtained from three boars of known fertility. The ejaculates were diluted in equal parts, with the commercial diluents A, B and C, constituting semen doses of 1.5 billion spermatozoids in volumes of […]

The experiment was carried out to evaluate the reproductive and animal performance and lipids deposition in the liver tissue of the Nile tilapia female, fed diets containing different levels of digestible energy, obtained by soybean oil inclusion. Three hundred breeding females and 100 breeding males were used, distributed in a completely randomized design with five treatments and four replications. The broods were fed diets containing 35% crude protein and 2,700; 2,950; 3,200; 3,450 and 3,700 kcal energy digestible/kg feed. The […]

A dynamic mathematical model was developed to describe the reproductive process in beef cattle production systems and to simulate individual cow reproductive performance while generating results for the herd, based on the body condition score (BCS) at calving and age at sexual maturity. The model is empiric and dynamic, containing deterministic and stochastic elements. The model was developed based on the relationship between BCS and postpartum interval for lactating cows; for heifers and non-lactating cows, the conception rate was based […]

This work presents a conceptual analysis of the main biotechnologies used in Chilean salmoniculture, which is based on the production of Atlantic salmon (Salmo salar, 356.407 t),silver salmon or coho (Oncorhynchus kisutch, 116.481 t), (O. tshawytscha, 2.062 t) and rainbow trout (O. mykiss, 189.178 t).These activities are focused on the photoperiod artificial manipulation to obtain out-of-season spawning, in the use of hormonal therapies which allow synchronizing the final oocyte maturation (FOM) and sexual maturity acceleration or the increase in milt […]

To assess the reproductive performance of beef cows submitted to estrus induction/synchronization, 42 Aberdeen Angus cows with body condition 3 (1-5 scale) under extensive management were used. The milk production was estimated through the weight-suckling-weight method. For gynecological examinations, ultrasound equipment and trans-rectal palpation were used. The milk production level (above and below the average production of cows), pregnancy, prebreeding reproductive condition (CRPA), surface anoestrus (uterine tone, follicles > 10 mm and absence of CL) and deep anoestrus (no uterine […]

This study aimed to evaluate the effects of hair coat traits (thickness (T), reflectance (R), length (L), diameter (D) and number of hairs per unit area (N)) and sweating rate (SR) on calving interval (CI, n = 423) and days to calving (DC, n = 1202) of Braford cows raised in Mato Grosso do Sul State, Brazil. Data were analyzed by least squares and the model for CI included the effects of age class of cow, genetic group, sire and […]

Testosterone levels to the body weight, relative and absolute testes weights, tunica albuginea thickness, germinative epithelium height, diameter and meiosis picture numbers of seminiferous tubules of 65 male quails were evaluated from June to October. The birds were grouped in cages (6 birds/cage) and lodged in a shed during all experimental period. The testis morphometric analysis was carried out from 60 days to 180 days old. The total testosterone plasmatic levels were dosed by radioimmunoassay method with antibody radioactivity marked. […]

This work aimed to evaluate the effect of the cutting height (10 cm and 20 cm) and cutting interval (30 days and 45 days) on the seed production of dallisgrass cultivated under field conditions. Plants were cut between September/2003 and June/2004, nine and six times, for the 30 d and 45 d cutting interval, respectively. Seed harvests were performed on 19/11/2004 (44 g of seeds/row) and 17/12/2004 (15.8 g of seeds/row). There was significant effect of the cutting management in […]

An experiment was conducted to evaluate the effects of CP intake during gestation on productive and reproductive performance of pregnant sows of 4th or 5th parturition orders. A total of 25 crossbred sows averaging 189.0±16.46 kg at 4th parity order was allotted to a completely randomized experimental design with three treatments (10, 13.5, and 17% of CP) and 18, 15 and 12 replicates, and each sow was considered an experimental unit. No treatment effects on sow weight gain from mating […]

Two females with colored urogenital organ, rounded off abdomen, color egg released, and uniform size and four males with semen released under abdomen pressure were selected to determine the best insemination dose for artificial fertilization of grey jundia, Rhamdia quelen (Quoy & Gaimardm, 1824), oocytes. Females and males received two doses of carp pituitary extract: the first one of 0.5 and 0.25 mg.kg-1 and the second of 5.0 and 2.5 mg.kg-1 for females and males, respectively. Both females produced 169 […]