Prediction of pasture intake by beef cattle in tropical conditions

The objective of this study was to evaluate the ruminal and intestinal digestion, the ruminal fermentation and the performance of beef cattle fed diets containing Stylosanthes silage (StS) and corn silage (CS). The treatments consisted of diets containing StS with different concentrate levels, based on dry matter (DM) (g/kg): 200 (StS-200), 400 (StS-400), 60 (StS-600), and a Control treatment with 600 g/kg CS and 400 g/kg concentrate (CS-400). In Experiment 1, 32 Nellore bulls, 364.28 ± 2.82 kg bodyweight, were distributed in a complete randomised design with eight replicates. Four Holstein × Zebu bulls (average bodyweight of 429 ± 15 kg) were used in Experiment 2, distributed in a 4 × 4 Latin square design. Nutrient intake was similar between StS-400 and CS-400 (P > 0.05), however, only StS-600 showed the same intake of total digestible nutrients as CS-400 (P < 0.05). Only the animals fed the StS-600 diet had similar (P > 0.05) average daily gain of carcass in comparison with those fed the Control diet. The StS-200 and StS-400 diets showed lower (P < 0.05) total tract digestibility of DM and crude protein than CS-400 (P < 0.05). Ruminal pH values of StS-200 and SE-400 were higher (P < 0.05) than in CS-400. The StS-600 diet showed a similar productive performance to CS in diets with 600 g/kg of concentrate, highlighting the potential use of this legume in diets for beef cattle in tropical conditions.

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Mineral Status and Supplementation of Grazing Beef Cattle Under Tropical Conditions in Guatemala: I. Macroelements

jpa ◽

10.2134/jpa1988.0347 ◽

1988 ◽

Vol 1 (4) ◽

pp. 347-350 ◽

Cited By ~ 3

Author(s):

Jose Luis Valdes ◽

L. R. McDowell ◽

Marvin Koger

Keyword(s):

Beef Cattle ◽

Mineral Status ◽

Tropical Conditions

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Prediction of dry matter intake by feedlot beef cattle under tropical conditions

Animal Production Science ◽

10.1071/an18767 ◽

2020 ◽

Author(s):

H. M. da Silva ◽

A. B. Donadia ◽

L.F. Moreno ◽

A.S. de Oliveira ◽

E. H. B. K. Moraes ◽

...

Keyword(s):

Beef Cattle ◽

Dry Matter ◽

Dry Matter Intake ◽

Tropical Conditions

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Prediction of Pasture Intake by Beef Cattle in Tropical Conditions

10.21203/rs.3.rs-657735/v1 ◽

2021 ◽

Author(s):

Geferson Antonio Fernandes ◽

André Soares de Oliveira ◽

Cláudio Vieira de Araújo ◽

Victor Rezende Moreira Couto ◽

Kamila Andreatta Kling de Moraes ◽

...

Keyword(s):

Beef Cattle ◽

Crude Protein ◽

Dry Matter ◽

Prediction Models ◽

Average Daily Gain ◽

Random Effect ◽

The Body ◽

Dry Matter Intake ◽

Accuracy And Precision ◽

Tropical Conditions

Abstract A meta-analytic study was conducted to develop and evaluate models for the prediction of pasture dry matter intake (DMIpasture) by beef cattle in tropical conditions. 804 individual observations of DMIpasture were used, taken from 23 studies through analysis of mixed models, including the study as a random effect. To evaluate the accuracy and precision of the new models proposed as well as for the models of Azevedo et al., (2016) and Minson and McDonald (1987), an independent databank with 87 means from treatments of 21 experiments (n = 888 animals) was used. Three prediction models were adjusted: Model I (Animal Information), Model II (Animal Information + Supplement) and Model III (Animal Information + Supplement + Pasture). The proposed models presented similarity for the average square root of the prediction error. The inclusion of the predictive variables for supplementation (supplement dry matter intake - DMIsupplement - % of the body weight and crude protein intake through supplement) with the variables for the animal (BW0,75 and average daily gain) and of the pasture (% of crude protein) in Model III improves accuracy and precision and provides higher determination and correlation coefficients, and agreement than the other proposed models. Similarly, it was found to be more accurate and precise than the equations of Azevedo et al., (2016) and Minson and McDonald (1987), which presented lower precision and accuracy than the proposed models. The DMIpasture for beef cattle in tropical conditions is more accurate and precise when the information for the animal, supplement and pasture is included.

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A meta-analysis of dry matter intake in Nellore and Zebu-crosses cattle

Revista Brasileira de Zootecnia ◽

10.1590/s1516-35982010000800024 ◽

2010 ◽

Vol 39 (8) ◽

pp. 1801-1809 ◽

Cited By ~ 5

Author(s):

José Augusto Gomes Azevêdo ◽

Sebastião de Campos Valadares Filho ◽

Douglas dos Santos Pina ◽

Mario Luiz Chizzotti ◽

Rilene Ferreira Diniz Valadares

Keyword(s):

Beef Cattle ◽

Significant Variation ◽

Dry Matter ◽

Meta Analysis ◽

Analysis Procedure ◽

Genetic Group ◽

Dry Matter Intake ◽

Regression Equations ◽

Tropical Conditions ◽

Nellore Cattle

The study was carried out to develop and to evaluate new equations to predict dry matter intake (DMI) of Nellore and Zebu-crosses cattle using meta-analysis procedure. The data used to estimate the parameters were collected from independent performance experiments using growing and fattening Nellore and Zebu-crosses cattle, and they were compiled from 561 experimental units. Before proposing an equation to predict DMI, it was observed that the genetic group was a source of statisticaly significant variation. Therefore, equations to predict dry matter intake in the Zebu-Crosses and Nellore cattle were independently developed. The regression equations for Zebu-crosses cattle were: DMI = -2.6098 + 0.08844BW0.75 + 4.4672ADG - 1.3579ADG2 and DMI = -1.0094 + 0.01608BW + 4.4363ADG -1.2548ADG2. The regression equations for Nellore cattle were: DMI = -2.7878 + 0.08789BW0.75 + 5.0487ADG - 1.6835ADG2 and DMI = -1.3559 + 0.0159BW + 5.6397ADG - 1.8494ADG2. In order to evaluate fitted equations, it was utilized data from independent experiments published from 2005 to 2008 in the Revista Brasileira de Zootecnia. The equations (DMI) for Nellore overpredicted dry matter intake for estimates lower than 7 and higher than 10 kg·d-1. For Zebu-crosses cattle, dispersions of 3 kg d-1 were observed when extreme intakes were evaluated, however, when the equation included BW 0.75, the intercept did not differ from zero and the slope did not differ from 1. It is not possible to fit only one equation for preditcting DMI for beef cattle in tropical conditions, because there are differences between Zebu and Zebu-crosses. Fitted equations that include ADG and BW 0.75 should be used as an alternative method to predict dry matter intake of Zebu-crosses and Nellore beef cattle in tropical conditions.

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Identification of the production system of beef cattle by the stable isotope analysis

Pesquisa Agropecuária Brasileira ◽

10.1590/s1678-3921.pab2020.v55.01501 ◽

2020 ◽

Vol 55 ◽

Author(s):

Alexandre Perdigão ◽

Cyntia Ludovico Martins ◽

Luiz Carlos Vieira Junior ◽

Maria Márcia Pereira Sartori ◽

Maria Betânia Niehues ◽

...

Keyword(s):

Stable Isotope ◽

Beef Cattle ◽

Production Systems ◽

Isotopic Ratio ◽

Cattle Production ◽

Classification Rate ◽

Δ13c And Δ15n ◽

Carbon And Nitrogen ◽

Tropical Conditions ◽

Beef Cattle Production

Abstract: The objective of this work was to evaluate the potential of the stable isotope technique to characterize beef cattle production systems in tropical conditions. For this, carbon and nitrogen stable isotopes were identified in non-defatted and defatted bovine muscles. A total of 45 cattle were evaluated in three production systems: pasture, conventional feedlot, and young beef bull feedlot (n = 15 per system). Samples from the Trapezius cervicis, Longissimus dorsi, and Semitendinosus muscles were collected to determine the isotopic composition of δ13C and δ15N. The isotopic data of the δ13C and δ15N of non-defatted and defatted muscles were subjected to the principal component analysis (PCA) and to the discriminant analysis (DA). The PCA allowed separating the three production systems based on the results obtained for the non-defatted and defatted muscles. A correct global classification rate of 100% and a cross-validation rate of 100% were obtained with the DA. The carbon and nitrogen isotopic ratio of non-defatted and defatted muscles allows for the precise identification of beef cattle production systems in tropical conditions.

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Mineral Status and Supplementation of Grazing Beef Cattle Under Tropical Conditions in Guatemala. II. Microelements and Animal Performance

jpa ◽

10.2134/jpa1988.0351 ◽

1988 ◽

Vol 1 (4) ◽

pp. 351-355 ◽

Cited By ~ 4

Author(s):

Jose Luis Valdes ◽

L. R. McDowell ◽

Marvin Koger

Keyword(s):

Beef Cattle ◽

Animal Performance ◽

Mineral Status ◽

Tropical Conditions

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399 The 25-hydroxyvitamin D3 supplementation improves animal performance of Nellore cattle grazed in tropical grass

Journal of Animal Science ◽

10.1093/jas/skz258.331 ◽

2019 ◽

Vol 97 (Supplement_3) ◽

pp. 161-161

Author(s):

Vinicius N Gouvêa ◽

Guilherme S Vasconcellos ◽

Tiago S Acedo ◽

Luis Fernando Tamassia

Keyword(s):

Beef Cattle ◽

Block Design ◽

Phase 1 ◽

Carcass Characteristics ◽

Control Group ◽

Vitamin Supplement ◽

Phase 2 ◽

Animal Performance ◽

Total Period ◽

Tropical Conditions

Abstract The objective was to evaluate the effects of 25-hydroxyvitamin D3 (HyD®) supplementation on performance and carcass characteristics of grazing Nellore beef cattle. Eighty finishing Nellore bulls were equally distributed according initial BW (437 ± 4.93 kg) in ten Brachiaria brizantha cv. Xaraés paddocks (8 bulls per paddock) using a randomized complete block design with five replicates (paddocks) per treatment. Experiment was conducted in two phases during dry season, from August to November 2017. Phase 1 consisted in all animals receiving the same basal concentrate for 33 days. In phase 2, animals received the treatments for the following 63 days: 1) Control (basal concentrate, no HyD®) or 2) HyD (basal concentrate + 1mg of HyD®/bull/day). The basal concentrate (18% CP and 80% TDN) was formulated to have 82.0% ground corn, 12.0% soybean meal and 6.0% mineral-vitamin supplement (as % DM), being daily offered to bulls at 7.0 kg/animal/day in collective feeders located at each paddock. Final BW (FBW) and average daily gain (ADG) were evaluated for phase 1, 2 and total period, while supplement intake, hot carcass weight (HCW) and dressing percentage was evaluated for total period only. Mineral-vitamin supplement and HyD® were provided by DSM Nutritional Products. Data were analyzed using the MIXED procedure of SAS® 9.3, with each paddock considered one experimental unit and values declared significant when P < 0.10. There was no treatment effect on phase 1 in FBW and ADG, as expected. In phase 2, treatment effects were observed for HyD in FBW (562.75 vs. 568.70; P = 0.094) and ADG (1.350 vs. 1.437 kg/day; P = 0.029) over the control group, respectively. Moreover, the total period ADG was greater for HyD treatment (1.311 vs. 1.375; P = 0.095). No effects were observed in carcass characteristics and concentrate intake. In conclusion, HyD® improves animal performance of Nellore beef cattle grazed in tropical conditions.

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