Escore visual como uma ferramenta eficiente para identificação de bovinos precoces

Abstract

A b s t r a c tThe hypothesis tested was that it is possible to identify animals that deposit fat and muscle earlier through indirect evaluation. Thus, the objective of this work was to evaluate the use of visual evaluation of precocity score for the identification of Nelore heifers with an early biotype. Eighteen Nelore heifers aged 9 to 11 months were evaluated visually for body structure (S), precocity (P), and muscle (M) scores. The animals were divided according to precocity scores: animals with scores 4, 5 and 6 were classified as early biotype and those with scores 1, 2 and 3 as late biotype. Loin eye area (LEA) and subcutaneous (SFT) and picanha (biceps femoris muscle) fat thickness (PFT) were measured by ultrasonography. Animals classified as precocious received higher scores (P≤0.05) for S (5.1 vs 2.4) and M (4.4 vs 2.6), which resulted in heavier animals (233.2 vs 202.8 kg). No biotype effect (P≥0.05) was observed for LEA (36.5 cm 2 ), but animals classified as precocious had higher (P≤0.05) SFT (1.3 vs 0.5 cm) and PFT (2.9 vs 2.3 cm). The standardized canonical coefficients showed that PFT (0.78) and the M (-1.02) score are the variables that most affect the first canonical variable positively and negatively, respectively. The first canonical variable explained 100% of the total variation in the traits evaluated. The precocity score was found to be an efficient alternative for the identification of precocious individuals. Animals with an early biotype were better differentiated by fat thickness in the biceps femoris

Predicting live weight using body volume formula in lactating water buffalo

“…The mean ± standard deviation estimated for body measurements were: HG (201.35 ± 14.99), BL (102.26 ± 11.89) and BV (333.62 ± 58.51). In general, the mean values of body measurements found in this study are consistent with those reported in female Murrah crossbred buffalo raised in Brazil (Melo et al, 2018, 2020 and India (Dhillod et al, 2017). Melo et al (2018) phenotypically describe the females of this buffalo breed as animals with long and wide chests, medium to long rumps, medium height, deep animals and long diagonal lines, which contribute positively to their reproductive and productive abilities.…”

“…In particular, the growth rate is an important parameter in animal production, as it characterizes the adaptability and economic suitability of livestock production (Ağyar et al ., 2022). Animals that grow faster in terms of body weight must also initiate early physiological functioning of reproduction and milk production (Thiruvenkadan et al ., 2009; Gurgel et al ., 2020). However, the uncontrolled increase in weight and body size of the animal leads to reproductive problems and increases production costs, due to the greater energy demand for its maintenance (Melo et al ., 2020).…”

Relationships between body mass index, ultrasound measurements and, internal body fat depots in pelibuey sheep

“…The measures evaluated in this research were influenced by environmental factors such as race, sexual status, age, and nutritional management (Oliveira et al 2017;Gurgel et al 2020;Vaz et al 2022), which justifies the variability observed in the data from this study. It should be noted that a diversified database is desirable to improve the predictive capacity and comprehensiveness of the generated equations (Menezes et al 2015;Gomes et al 2021;Gurgel et al 2021).…”

Strategic diagnosis of a property specialized in breeding, rearing and finishing beef cattle in the southern region of Piauí

“…-Reducing the reproduction cycle Growth, reproduction and finishing precocities are important for reducing the cattle raising cycle, for greater capital turnover and, consequently, for greater efficiency in the activity. Precocity can be understood as the speed at which cattle reach puberty (Gurgel et al, 2020), when bone growth is completed and most of the muscles are formed. At puberty, the growth hormones responsible for growing bone and muscle tissue are replaced by sex hormones, when females enter estrus and males have an increase in their scrotal circumference.…”