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Determining the Association of the Dry Period Duration with Dystocia and Stillbirths in Dairy Cows by Considering Parity, Season, and Gestation Length.

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العنوان: Determining the Association of the Dry Period Duration with Dystocia and Stillbirths in Dairy Cows by Considering Parity, Season, and Gestation Length.
المؤلفون: Jukna, Vigilijus1 (AUTHOR) vigilijus.jukna@vdu.lt, Meškinytė, Edita1 (AUTHOR) edita.meskinyte@vdu.lt, Antanatis, Ramūnas2 (AUTHOR) ramunas.antanaitis@lsmu.lt, Paulauskas, Algimantas3 (AUTHOR) algimantas.paulauskas@vdu.lt, Juozaitienė, Vida3 (AUTHOR) ramunas.antanaitis@lsmu.lt
المصدر: Animals (2076-2615). May2024, Vol. 14 Issue 10, p1444. 13p.
مصطلحات موضوعية: *STILLBIRTH, *DYSTOCIA, *DAIRY cattle, *PREGNANCY, *LACTATION in cattle, *DAIRY farms
مستخلص: Simple Summary: Our research proposed a hypothesis suggesting that the duration of the dry period could potentially be correlated with the occurrences of dystocia and stillbirths, considering factors such as a cow's parity, the year, the season, and the length of the gestation period. Moreover, it could have varying impacts on these crucial profitability indicators for dairy farms. The outcomes unveil notable connections between the incidence of dystocia and the length of the gestation period, calving season, and stillbirth. The key risk factors identified for stillbirths encompassed dystocia, parity, the calving season, the gestation period length, and the dry period length. Cows with dystocia had twice the odds of stillborn calves compared to those without dystocia. An increase in parity decreased the odds of stillborn calves. Cows calving from May to October had lower odds of dystocia and stillborn calves compared to those calving between November and April. A longer gestation period was associated with a higher probability of dystocia and calf mortality. Additionally, the analysis revealed that a prolonged dry period increased the odds of stillbirth. In summary, the findings of this study offer insights that may aid the dairy industry in making informed management decisions to mitigate the dystocia and stillbirth rates in cows. This study aimed to assess the relationship between the length of the dry period (DL) and the risks of dystocia and stillbirths in Holstein cows. A total of 1072 healthy cows in lactations 1 and ≥2 were categorized based on the DL (mean: 58.07 ± 0.33 days) into three groups: short DL (<40 days; 13.0% of cows), medium DL (40–70 days; 60.1%), and long DL (>70 days; 26.9%). Dystocia occurred in 12.4% of cows, while stillbirths accounted for 4.1% of calves. The medium DL group had the highest number of unassisted calvings. The dystocia rates were 11.4% for cows with gestation (GA) ≤ 274 days; 6.0% for cows with GA = 275–282 days; and 19.9% for cows with GA ≥ 283 days (p < 0.001). In season 1 (November–April), dystocia occurred in 15.0% of cases compared to 8.8% in season 2 (May–October) (p < 0.001). The stillbirth rates ranged from 3.6% to 4.0% for cows with medium and long DLs; while those with a short DL had 5.8% (p < 0.05). The stillbirth rates were 5.2% for cows with GA ≤ 274 days; 3.2% for cows with GA = 275–282 days; and 5.1% for cows with GA ≥ 283 days (p < 0.001). Season 1 had a stillbirth rate of 4.8%, while season 2 had a stillbirth rate of 3.3% (p < 0.001). This research provides insights that could assist the dairy industry in making informed decisions to reduce the incidence rates of dystocia and stillbirths in cows. [ABSTRACT FROM AUTHOR]
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