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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Relationship between performance, metabolic profile, and feed efficiency of lactating beef cows

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Author(s):
Souza, Luana Lelis [1] ; Zorzetto, Mariana Furtado [1] ; Terra Ricci, Tulio Jose [1] ; Canesin, Roberta Carrilho [1] ; Dias e Silva, Nhayandra Christina [2] ; Negrao, Joao Alberto [3] ; dos Santos Goncalves Cyrillo, Joslaine Noely [1] ; Zerlotti Mercadante, Maria Eugenia [1]
Total Authors: 8
Affiliation:
[1] Ctr Avancado Pesquisa Bovinos Corte, IZ, Sertaozinho, SP - Brazil
[2] Univ Jose do Rosario Vellano UNIFENAS, Alfenas, MG - Brazil
[3] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos, Pirassununga, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 51, n. 7, p. 2045-2055, SEP 2019.
Web of Science Citations: 0
Abstract

Twenty-seven Nellore cow-calf pairs were submitted for feed efficiency testing. The animals were weighed every 21 +/- 5 days to obtain metabolic body weight (BW0.75) and average daily gain (ADG). Subcutaneous fat thickness (SFT; at 20, 83, 146, and 176 days post-calving); milk yield and components (63, 85, and 151 days); levels of glucose, cholesterol, triglycerides, beta-hydroxybutyrate, albumin, urea, creatinine, calcium, phosphorus, magnesium, insulin, and cortisol (15, 41, 62, and 124 days); and ingestive behavior were evaluated. Residual feed intake was calculated for the first stage (RFI1; 21 to 100 days post-calving) and the second stage of lactation (RFI2; 100 to 188 days post-calving), and the cows were classified based on RFI1 as most efficient (RFI1 < 0) and least efficient (RFI1 > 0). Negative RFI1 cows consumed 1.3 kg/day of dry matter, or 9.77%, less than positive RFI1 cows. Most- and least-efficient cows did not differ in terms of subcutaneous fat thickness traits and milk yield or energy-corrected milk (ECM). Glucose (P = 0.0785), triglycerides (P = 0.0795), and phosphorus (P = 0.0597) concentrations were higher in the first stage of lactation in most-efficient cows. Maternal characteristics such as calf weight at birth and at 205 days and ADG were similar in most- and least-efficient cows. The most-efficient cows are more economic as they consume less feed for the same level of production. (AU)

FAPESP's process: 15/02066-4 - PHENOTYPIC EVALUATION OF FEED AND PRODUCTIVE EFFICIENCY, AND METABOLIC PROFILE OF NELLORE COWS
Grantee:Maria Eugênia Zerlotti Mercadante
Support type: Regular Research Grants