| Full text | |
| 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 Opportunities: | Regular Research Grants |