Indicators of Stress in Response to Intramuscular Oxytocin Injection to Induce Milk Ejection of Dairy Cows in the Tropics of Veracruz
DOI:
https://doi.org/10.47808/revistabioagro.v2i1.307Keywords:
oxytocin, milk ejection, stress indicatorsAbstract
The objective was to determine the effect of intramuscular injection of oxytocin to induce milk ejection on stress indicators and rectal temperature in cows mechanically milked in the tropics of Veracruz. Crossbred (n=96) cows (American Brown Swiss-Cebu and Holstein-Cebu) milked 2 times a day were used. After calving cows were randomly assigned according to the number of lactations to receive a 10 IU oxytocin intramuscularly injection at milking (n = 56) or NOT be injected (n = 30). During milking, the following variables were observed: trampling, kicking, tail movement, stop eating, if it moved abruptly and after milking took rectal temperature (RT). Statistical analysis was performed using ANOVA and chi-square using the software Statistica 7. Cows injected with oxytocin had a greater (P =
.05) percentage of animals trampled and kicked (53%), stopped eating (61%), moved the tail (71.4%) and moved abruptly (71.5%) compared to cows that were Not injected (10%, 0%, 3%, 3%, 6%, respectively). Cows injected with oxytocin had higher rectal temperature (39.13 ± 0.08 oC) and number of trampling (2.62 ± 0.36) compared to cows that were Not injected (38.96 ± 0.12 °C and 0.24 ± .54, respectively). In conclusion, cows injected with oxytocin had increased stress indicators and rectal temperature compared with cows that were not injected. Cows injected intramuscularly and routinely with oxytocin showed a stress reaction; therefore it is possible to suggest that these cows do not habituate to the oxytocin injection.
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Copyright (c) 2014 Miguel Ángel Lammoglia Villagomez, Estrella Matínez B., Braulio Aedo Y Loya, Iliana Del Carmen Daniel Rentería y Nora Garcez
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