Abstract
This study aimed to evaluate the performance, feed efficiency, feeding behavior, and cortisol concentrations of lambs ranked into different groups of Residual Feed Intake (RFI) and Residual Intake and Gain (RIG). Forty Santa Inês lambs with a mean initial age of 120 ± 30 days and mean initial (IBW) and final body weight (FBW) of 28.9 ± 3.2 and 43.7 ± 3.9 kg, respectively, were used. The animals were fed at an automatic feed and water station (Intergado®) for 60 days and classified at the end of the experiment as low-RFI/RIG, medium-RFI/RIG, and high-RFI/RIG according to RFI and RIG. Performance, feed efficiency measures, ingestive behavior, temperament, and cortisol concentrations were measured, and Pearson’s correlation analysis was performed to evaluate the relationship between the variables studied. The variables that differed most between RFI groups were dry matter intake, feed conversion, and feed efficiency, with better values in efficient animals (RFI−). Regarding the RGI groups, the average daily gain of animals classified as RIG- was 19.37% lower than that of animals classified as RIG± and 39.28% lower than that of animals classified as RIG+. Only the hourly feeding rate per day (p = 0.04) differed significantly between RFI and RIG classes, while no differences were observed for the ingestive behavior variables or cortisol. The number of visits to the feed bunk (total, with or without intake) showed no correlation with any performance or efficiency measure. Identifying animals ranked into different RFI and RIG classes shows that more efficient animals have a lower feed intake for the same weight gain and spend less time at the feed bunk.
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Abbreviations
- ADF:
-
Acid detergent fiber
- ADIN:
-
Acid detergent insoluble nitrogen
- ADG:
-
Average daily gain
- BW0.75:
-
Average metabolic weight
- BW:
-
Body weight
- CF:
-
Crude fiber
- CP:
-
Crude protein
- NVC:
-
Daily frequency of visits with intake
- NVWC:
-
Daily frequency of visits without intake
- DM:
-
Dry matter
- DMI:
-
Dry matter intake
- DWG:
-
Daily weight gain
- EE:
-
Ethereal extract
- FC:
-
Feed conversion
- FE:
-
Feed efficiency
- FRT:
-
Feed rate per visit to the feed bunk
- FBW:
-
Final body weight
- TNV:
-
Frequency of total visits
- FRh/d:
-
Hourly feed rate per day
- IBW:
-
Initial body weight
- KR:
-
Kleiber rate
- MDG:
-
Mean daily gain
- MM:
-
Mineral matter
- NDF:
-
Neutral detergent fiber
- NDIN:
-
Neutral detergent insoluble nitrogen
- NFC:
-
Non-fibrous carbohydrates
- NNE:
-
Non-nitrogenous extractives
- RFID:
-
Radio-frequency identification
- RGR:
-
Relative growth rate
- RFI:
-
Residual Feed Intake
- RGi:
-
Residual gain index
- RIG:
-
Residual Intake and Gain
- TDN:
-
Total digestible nitrogen
- TTSC:
-
Total time spent in the feed bunk
- TNV:
-
Total number of visits (per day)
- NVC:
-
Total number of visits with intake (per day)
- NVCW:
-
Total number of visits without intake (per day)
- TSC:
-
Total time spent in the feed bunk with intake
- TTSC:
-
Total time spent in the feed bunk (minutes)
- TSWC:
-
Total time spent in the feed bunk without intake
- WI:
-
Water intake
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The research was supported by Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES).
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LVCS, DNG, CC, CPdP, and RLDdC: methodological design and conceptualization of the idea, treatment and data analysis, writing, and final revision; CPdP and RLDdC: supervision and administration of the experimental project, writing, and final revision; CPdP, JF, and RLDdC: writing, final revising the manuscript critically for important intellectual content
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This experiment was approved by the Ethics Committee of the Instituto de Zootecnia (process number: Process number 19, 2018).
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This investigation was carried out as a result of the final exam for Master Science of L.V.C. Sartori, student of the Programa de Pós Graduação em Produção Animal Sustentável, of the Instituto de Zootecnia, located in Nova Odessa, SP, Brazil.
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Sartori, L.V.C., Gurgeira, D.N., Crisóstomo, C. et al. Performance, feed efficiency, feeding behavior, and cortisol concentration of lambs ranked for Residual Feed Intake and Residual Intake and Gain. Trop Anim Health Prod 56, 51 (2024). https://doi.org/10.1007/s11250-024-03894-3
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DOI: https://doi.org/10.1007/s11250-024-03894-3