التفاصيل البيبلوغرافية
| العنوان: |
Differences in dry matter intake of primiparous and multiparous lactating dairy cows assessed through multiple on-cow accelerometer sensors |
| المؤلفون: |
Michelotti, T. C., Encarnación, S., Halfen, J., Fernandes, T., Suazo, M., Bonilla, J., Paz, A., Bulnes, M., Osorio, J. S. |
| المصدر: |
Dairy Science Publication Database |
| بيانات النشر: |
Open Public Research Access Institutional Repository and Information Exchange |
| سنة النشر: |
2021 |
| المجموعة: |
South Dakota State University (SDSU): Open PRAIRIE (Public Research Access Institutional Repository and Information Exchange) |
| مصطلحات موضوعية: |
accelerometer, intake, sensor technology |
| الوصف: |
The objective of this study was to evaluate the use of 3-dimensional accelerometer sensors to estimate dry matter intake (DMI) in primipa- rous (PP) and multiparous (MP) lactating dairy cows. Forty mid- to late-lactation Holstein dairy cows (20 PP, 136 ± 21 DMI and 20 MP, 170 ± 51 DMI) housed in a freestall barn were fitted with 3 sensors that record acceleration in the 3-axis (i.e., x, y, and z), one sensor on the lateral side of the left hind leg and 2 attached to a halter directly superpose over the jaw and nose. Cows were assigned to either a collection (A; n = 20) or validation group (B; n = 20), and each group was comprised of 10 PP and 10 MP cows. Sensors were set to record the 3D accelera- tions at 10-s intervals. Cows were trained to use Calan gates during a 7-d period followed by a 10-d period of data collection of acceleration and individual intakes. Acceleration models highly associated with DMI determined in a previous study (Carpinelli et al., 2019; J Dairy Sci, 102:11483) were used to cross-reference accelerometer data, and DMI in group A. Six additional variables were derived from jaw and nose accelerations by measuring the change in acceleration between 2 consecutive time points (i.e., lag time). The REG procedure of SAS was used in group A to obtain the intercept (B0) and slope (B1) for each acceleration model. Then, in group B, B0 and B1 were used in the respec- tive acceleration models to derive an acceleration-based DMI (DMIA). The DMIA generated for MP and PP in group B was tested using the MIXED procedure of SAS to confirm parity differences in DMI. As expected, MP cows had a greater (P < 0.01) DMI than PP (27.2 vs 23.1 ± 0.6 kg/d). Similarly, the LegZ+JawX+LagNoseY model was able to capture the difference in DMIA between MP and PP cows (P < 0.05; 26.1 vs. 25.5 ± 0.2 kg/d), while there was a trend (P = 0.06) for differences in DMIA between groups when applying the JawX+LagNoseY (26.0 vs 25.7 ± 0.1 kg/d) and LegZ+JawX (26.1 vs 25.6 ± 0.2 kg/d) models. The contrasting underestimation ... |
| نوع الوثيقة: |
text |
| اللغة: |
unknown |
| Relation: |
https://openprairie.sdstate.edu/dairy_pubdb/2355 |
| الاتاحة: |
https://openprairie.sdstate.edu/dairy_pubdb/2355 |
| رقم الانضمام: |
edsbas.EDFA10B8 |
| قاعدة البيانات: |
BASE |