Limits...
Lactation Curve Pattern and Prediction of Milk Production Performance in Crossbred Cows.

Jingar S, Mehla RK, Singh M, Roy AK - J Vet Med (2014)

Bottom Line: Parity-wise lactation curve revealed a decrease in persistency, steeper decline in descending slope (c), and steeper increase in ascending slope (b) from 1st to 5th and above parity.Clinical mastitis resulted in a significantly higher loss of milk yield (P < 0.05).The FTDMY was maximum (P < 0.05) in the fourth parity in comparison to the rest of parity.

View Article: PubMed Central - PubMed

Affiliation: National Dairy Research Institute, Karnal 132 001, India ; KVK, Chittorgarh, Rajasthan 312001, India.

ABSTRACT
Data pertaining to 11728 test-day daily milk yields of normal and mastitis Karan Fries cows were collected from the institute herd and divided as mastitis and nonmastitis and parity-wise. The data of lactation curves of the normal and mastitis crossbred cows was analyzed using gamma type function. FTDMY in normal and mastitis cows showed an increasing trend from TD-1 to TD-4 and a gradual decrease (P < 0.01) thereafter until the end of lactation (TD-21) in different parities. The FTDMY was maximum (peak yield) in the fourth parity. Parity-wise lactation curve revealed a decrease in persistency, steeper decline in descending slope (c), and steeper increase in ascending slope (b) from 1st to 5th and above parity. The higher coefficient of determination (R (2)) and lower root mean square error (RMSE) indicated goodness and accuracy of the model for the prediction of milk prediction performance under field conditions. Clinical mastitis resulted in a significantly higher loss of milk yield (P < 0.05). The FTDMY was maximum (P < 0.05) in the fourth parity in comparison to the rest of parity. It is demonstrated that gamma type function can give the best fit lactation curve in normal and mastitis infected crossbred cows.

No MeSH data available.


Related in: MedlinePlus

Comparison of the actual and predicted FTDMY of normal and mastitic Karan Fries cows in the first lactation.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4590836&req=5

fig1: Comparison of the actual and predicted FTDMY of normal and mastitic Karan Fries cows in the first lactation.

Mentions: The fortnightly test-day milk yield was less in TD-1 (9.78 ± 0.29 kg/d) and increased (P < 0.01) gradually to attain peak in TD-3 and TD-4 (14.34 ± 0.38 and 14.48 ± 0.37 kg/d) in normal cows; however, in mastitis cows, the peak milk yield was attained in TD-3 (13.15 ± 0.37 Kg/d) and was maintained only for this period (Figure 1). The cows of both of the groups exhibited a steady decline (P < 0.01) in milk yield with increase in fortnights of lactation. In general the fortnightly test-day milk yield increased till TD-3 and declined steadily with advancement of lactation. In the second parity the FTDMY showed an increasing trend from TD-1 to TD-4 and decreased thereafter gradually in both of the groups. A minimum FTDMY of 11.31 ± 0.39 kg/d and 9.18 ± 0.44 kg/d and a maximum FTDMY of 17.19 ± 0.44 kg/d and 15.53 ± 0.46 kg/d were observed on TD-4 in both of the groups (Figure 2). The minimum FTDMY ranged from 11.25 ± 0.46 kg/d to 9.55 ± 0.47 kg/d in TD-21 and the maximum FTDMY of 19.08 ± 0.53 kg/d and 16.44 ± 0.47 kg/d was observed in TD-4 in normal and mastitis KF cows. However an increase in FTDMY was observed from 14.36 kg and 12.34 kg in TD-1 to a peak yield of 20.50 ± 0.59 kg/d in TD-4 and 17.63 kg/d in TD-3 which subsequently declined (P < 0.05) to 10.50 ± 0.54 kg/d and 9.54 ± 0.54 kg/d in TD-21 in normal and mastitis KF cows (Figure 3). The FTDMY milk yield in the 4th parity was maximum in comparison to the first, second, and third parity in both normal and mastitis cows (Figure 4, Table 2). An increase in milk production was observed up to the 4th fortnight and milk productions decreased (P < 0.01) during the 5th parity in normal cows. In mastitis cows increase in milk yield was noticed during the first three fortnights and milk production decreased subsequently (P < 0.05) until the end of lactation (Figure 5).


Lactation Curve Pattern and Prediction of Milk Production Performance in Crossbred Cows.

Jingar S, Mehla RK, Singh M, Roy AK - J Vet Med (2014)

Comparison of the actual and predicted FTDMY of normal and mastitic Karan Fries cows in the first lactation.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4590836&req=5

fig1: Comparison of the actual and predicted FTDMY of normal and mastitic Karan Fries cows in the first lactation.
Mentions: The fortnightly test-day milk yield was less in TD-1 (9.78 ± 0.29 kg/d) and increased (P < 0.01) gradually to attain peak in TD-3 and TD-4 (14.34 ± 0.38 and 14.48 ± 0.37 kg/d) in normal cows; however, in mastitis cows, the peak milk yield was attained in TD-3 (13.15 ± 0.37 Kg/d) and was maintained only for this period (Figure 1). The cows of both of the groups exhibited a steady decline (P < 0.01) in milk yield with increase in fortnights of lactation. In general the fortnightly test-day milk yield increased till TD-3 and declined steadily with advancement of lactation. In the second parity the FTDMY showed an increasing trend from TD-1 to TD-4 and decreased thereafter gradually in both of the groups. A minimum FTDMY of 11.31 ± 0.39 kg/d and 9.18 ± 0.44 kg/d and a maximum FTDMY of 17.19 ± 0.44 kg/d and 15.53 ± 0.46 kg/d were observed on TD-4 in both of the groups (Figure 2). The minimum FTDMY ranged from 11.25 ± 0.46 kg/d to 9.55 ± 0.47 kg/d in TD-21 and the maximum FTDMY of 19.08 ± 0.53 kg/d and 16.44 ± 0.47 kg/d was observed in TD-4 in normal and mastitis KF cows. However an increase in FTDMY was observed from 14.36 kg and 12.34 kg in TD-1 to a peak yield of 20.50 ± 0.59 kg/d in TD-4 and 17.63 kg/d in TD-3 which subsequently declined (P < 0.05) to 10.50 ± 0.54 kg/d and 9.54 ± 0.54 kg/d in TD-21 in normal and mastitis KF cows (Figure 3). The FTDMY milk yield in the 4th parity was maximum in comparison to the first, second, and third parity in both normal and mastitis cows (Figure 4, Table 2). An increase in milk production was observed up to the 4th fortnight and milk productions decreased (P < 0.01) during the 5th parity in normal cows. In mastitis cows increase in milk yield was noticed during the first three fortnights and milk production decreased subsequently (P < 0.05) until the end of lactation (Figure 5).

Bottom Line: Parity-wise lactation curve revealed a decrease in persistency, steeper decline in descending slope (c), and steeper increase in ascending slope (b) from 1st to 5th and above parity.Clinical mastitis resulted in a significantly higher loss of milk yield (P < 0.05).The FTDMY was maximum (P < 0.05) in the fourth parity in comparison to the rest of parity.

View Article: PubMed Central - PubMed

Affiliation: National Dairy Research Institute, Karnal 132 001, India ; KVK, Chittorgarh, Rajasthan 312001, India.

ABSTRACT
Data pertaining to 11728 test-day daily milk yields of normal and mastitis Karan Fries cows were collected from the institute herd and divided as mastitis and nonmastitis and parity-wise. The data of lactation curves of the normal and mastitis crossbred cows was analyzed using gamma type function. FTDMY in normal and mastitis cows showed an increasing trend from TD-1 to TD-4 and a gradual decrease (P < 0.01) thereafter until the end of lactation (TD-21) in different parities. The FTDMY was maximum (peak yield) in the fourth parity. Parity-wise lactation curve revealed a decrease in persistency, steeper decline in descending slope (c), and steeper increase in ascending slope (b) from 1st to 5th and above parity. The higher coefficient of determination (R (2)) and lower root mean square error (RMSE) indicated goodness and accuracy of the model for the prediction of milk prediction performance under field conditions. Clinical mastitis resulted in a significantly higher loss of milk yield (P < 0.05). The FTDMY was maximum (P < 0.05) in the fourth parity in comparison to the rest of parity. It is demonstrated that gamma type function can give the best fit lactation curve in normal and mastitis infected crossbred cows.

No MeSH data available.


Related in: MedlinePlus