Production indices for dual purpose cattle in central Brazil

McManus, Concepta; Louvandini, Hélder; Carneiro, Helena Cristina Rodrigues; Lima, Paulo Ricardo Martins; Neto, José Braccini

doi:10.1590/s1516-35982011000700025

Cited by 12 publications

(3 citation statements)

References 40 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In beef cattle breeding systems, mating takes place during the hottest months of the year and bulls are subject to environmental variations that may interfere with their fertility and herd reproductive effectiveness (Berry, Evans, & Parland, ; Lunstra & Coulter, ). Nevertheless, the reproductive success is one of the most important factors affecting the profitability of the cow–calf system (McManus, Louvandini, Carneiro, Lima, & Neto, ; Menegassi, Barcellos, Lampert, Borges, & Peripolli, ). Perhaps, it is always recommended, before the beginning of the breeding season, to evaluate bulls by the breeding soundness examination (BSE) that is still the most accurate and economical approach to predict fertility (Chenoweth, Hopkins, Spitzer, & Larsen, ).…”

Section: Introductionmentioning

confidence: 99%

Infrared thermography as a noninvasive method to assess scrotal insulation on sperm production in beef bulls

et al. 2017

View full text Add to dashboard Cite

This study evaluated the thermoregulation and spermatogenic changes by scrotal temperature gradient using infrared thermography in testicular compromised bulls. Bulls were insulated (n = 6) for 72 hr and control animals (n = 3) remained without insulation during all the experimental period. Seminal evaluation was performed prior, at insult removal and once per week for 13 consecutive weeks. Mean temperature gradient in insulated animals was lower at the time of insulation removal compared to the week prior and after the insult (p < .05). Two weeks after insult, sperm motility was lower in insulated compared to control animals (p < .01) and spermatozoa total defects were higher in insulated compared to control animals (p < .05). Two and seven weeks after insult, the major defects were higher in insulated compared to control animals (p < .05). Scrotal temperature gradient showed a positive correlation with sperm mass motion (p < .01) and a negative correlation with ocular globe temperature (p < .01) in insulated animals. The infrared thermography can be used to evaluate ocular globe temperature in bulls; however, it is only effective to detect changes in scrotal temperature gradient at the insult removal.

show abstract

Section: Introductionmentioning

confidence: 99%

Infrared thermography as a noninvasive method to assess scrotal insulation on sperm production in beef bulls

et al. 2017

View full text Add to dashboard Cite

show abstract

“…When they reach at older age, the organic capacity of the productive tract is fully developed, and nutrients are primarily directed to the maintenance and milk yield processes. As aging the animal, it has been observed a reduction in the number of secretory cells available for MY, leading to decreased function and a consequent reduction in MY (Capuco & Akers, 1999;Teodoro et al, 2000;Dobson et al, 2007;McManus et al, 2011;Baratta et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Reproductive efficiency and milk yield in Sindhi breed cattle

Barros¹,

Mello²,

Sousa³

et al. 2020

Braz. J. Vet. Med.

View full text Add to dashboard Cite

The aim of this study was to identify the average of productive and reproductive traits in Red Sindhi females and evaluate if there is an influence of the reproductive traits on milk yield in this breed. Data related to reproductive and productive traits of 638 Sindhi breed dairy cows from North, Northeast, Midwest and Southeast regions of Brazil were provided by ABCZ. Analysis of variance followed by analysis of correlation among reproductive traits and between these and milk yield traits were used. Averages for age at first calving (AFC), calving age (CA), calving interval (CI), reproductive efficiency (RE), dry period (DP), lactation period (LP),milk yield (MY), and total milk yield (TMY) were 1549.

show abstract

“…However, it did not affect behavioral parameters, such as panting score and grazing times. This may be due to the adaptation of these breeds to these environment, since crossbred Gyr (with Holstein-Friesian and Simental) cows were more productive in the Cerrado system than purebred Gyr for calf and milk production, as well as reproductive traits [ 48 ], and while genetic group and environment (sun and shade) did not affect rectal temperature, respiration rate was increased in crossbred animals [ 2 ].…”

Section: Discussionmentioning

confidence: 99%

Shade Modifies Behavioral and Physiological Responses of Low to Medium Production Dairy Cows at Pasture in an Integrated Crop-Livestock-Forest System

Reis

Ferreira

Mazocco

et al. 2021

Animals

View full text Add to dashboard Cite

Under conditions of high temperature, humidity, and incidence of solar radiation, dairy cows use behavioral changes as a strategy to decrease the metabolic heat production at pasture. The objective of this study was to evaluate the behavioral and physiological responses of Gyr and Girolando (5/8 Holstein 3/8 Gyr, and ½ Holstein ½ Gyr) dairy cows submitted to environments with and without shade. The experiment was conducted at Embrapa Cerrados (Technology Center for Dairy Zebu breeds—CTZL), Brasilia, Distrito Federal—Brazil, with 48 Gyr and Girolando cows total in the lactation group, with low to medium milk production, in full sun or shade with Eucalyptus urograndis (267 plants/ha−1). The physiological and behavioral characteristics evaluated were panting score, superficial temperature, and time spent grazing, ruminating, and lying down. Other traits included skin and coat thickness, hair diameter, density and length, and predominant coat color. In addition, body measurements, such as body length, the height of withers, chest circumference, and shin circumference, were measured. Shaded cows had 34% longer rumination times than cows in full sun (p = 0.01). With a temperature-humidity index ranging from 79 to 83, the rumination time was 1.7 times higher in cows under shade (p = 0.01) during a 24-h period of observation. There were no significant differences in the grazing time between the environments, but lying time was 23% longer in cows under the sun (p = 0.01). The panting score was not influenced by the environment (p = 0.17). Girolando cows had a 35% higher panting score than Gyr cows (p = 0.01) regardless of the environment. The panting score increased two and a half times during the afternoon compared with the morning (p = 0.01). The surface and rectal core temperatures had significant differences between treatments and time of the day. Body measurements were not different between cows in both environments, but there was a difference between breeds. The use of trees in pastures with a silvopastoral system for dairy zebu cows is indicated to improve grazing behavior, as well as time spent ruminating and lying down.

show abstract

Production indices for dual purpose cattle in central Brazil

Cited by 12 publications

References 40 publications

Infrared thermography as a noninvasive method to assess scrotal insulation on sperm production in beef bulls

Infrared thermography as a noninvasive method to assess scrotal insulation on sperm production in beef bulls

Reproductive efficiency and milk yield in Sindhi breed cattle

Shade Modifies Behavioral and Physiological Responses of Low to Medium Production Dairy Cows at Pasture in an Integrated Crop-Livestock-Forest System

Contact Info

Product

Resources

About