Characteristics, Curve and Persistency of Lactation in Gir Cows

Chaudhari, P. R.; Kapadiya, Pratik; Gadariya, M. R.; Gamit, Pranav; Savaliya, B. D.

doi:10.5455/ijlr.20211027045505

Cited by 2 publications

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“…It is possible to make such a choice by taking advantage of partial yield records before the total lactation yields of the animals are completed with regression analysis methods. Chaudhari et al (2022) studied predicting standard lactation milk yield by simple regression equation from weekly, fortnightly, and monthly, individual and cumulative part yield in Jafarabadi buffalo. They revealed that correlation coefficients between 305-day milk yield and different weekly (1st to 20th week), fortnightly (1st to 5th fortnight), and monthly (1st to 5th month), individual and cumulative part lactations were positive and significant (p<0.01) and showed an increasing trend with the advancement of lactation.…”

Section: Discussionmentioning

confidence: 99%

Relationships Between Partial Milk Yield and Actual Milk Yield According to Parity in Buffaloes

Soysal,

Gürcan,

Ünal

2024

Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi

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In this study, the relationships between 100-day of partial milk yield and 270-day of additive and total milk yield of buffaloes according to different parity were investigated. A total of 697 lactation records belonging to 135 heads of buffalo and seven lactations were used in the material. The relationships between the animals' 100-day partial milk yield for 270-day and total milk yield were analyzed for seven lactations. In the study, 100-day milk yield was taken as an independent variable, 270-day and total milk yields as dependent variables, and possible relationships were determined according to simple and multiple linear regression analysis methods. The average lactation period was 256.74 ± 2.61 days, the average 270-day additive milk yield was 2078 ± 65.26 litres and the average total milk yield was 1831 ± 89.57 litres. The daily average milk yields were 7.69 ± 0.11 and 7.08 ± 0.07 liters for 270-day and 100-day respectively. The correlation coefficients were calculated for each parity and calculated as 0.901 (p < 0.01) between the 100-day and 270-day additive yield for the general group. The simple and multiple linear regression equations were shown as [V270 = 470.72 + 1.737 V100 (R2 = 80.2%)], [V270 = 966.23 + 0.645 V100 + 0.001V1002 (R2 = 82.4%)] for the groups. As the parity of lactation increased, it was seen that the determination coefficients were increased. Finally, predicting the total lactation yield by using 100-day of partial milk yield has the highest accuracy.

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Section: Discussionmentioning

confidence: 99%

Relationships Between Partial Milk Yield and Actual Milk Yield According to Parity in Buffaloes

Soysal,

Gürcan,

Ünal

2024

Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi

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“…Chaudhari et al . (2022) evaluating Gyr cows of different parity found that milk production persisted above 90% until 7th month postpartum. Lactation persistency must be considered in dairy Gyr cows because they usually have shorter lactations and lower persistency of milk production compared with Holstein cows (Costa et al ., 2005).…”

Section: Discussionmentioning

confidence: 99%

Relationship among thermal environment, stage of lactation, body characteristics, yield and milk constituents of dairy Gyr cows managed on pasture

De-Sousa,

Ligori,

Gonçalves

et al. 2024

Journal of Dairy Research

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Our aims were to evaluate changes in body characteristics, milk yield and milk constituents as well as to determine the relationship between the thermal environment and production characteristics during the first lactation of dairy Gyr cows managed on pasture. Between 2013 and 2015, forty-five primiparous dairy Gyr cows were evaluated from prepartum to 10 months of lactation in Southeast of Brazil. Body weight, body condition score (BCS), subcutaneous fat thickness (SFT), milk yield (305 d), and milk constituents were collected monthly and progesterone was collected weekly. Additionally, we determined the temperature humidity index (THI) based on microclimate data. Overall, the cows lost body weight until six months of lactation and there was a progressive decrease in BCS, SFT, milk yield and milk lactose as the months in lactation progressed. In contrast, there was an increase in milk fat, milk protein and milk solids. The thermal environment did not pose a consistent heat challenge, nevertheless, we found a positive correlation between the average THI two days before milk collection with milk yield, fat and lactose contents, but in contrast a negative correlation was found with total solids and protein. In conclusion, the THI and months of lactation affected the yield and constituents of milk. However, more studies are necessary to understand the impacts of body characteristics and thermal environment on yield and milk constituents throughout the productive life of Gyr dairy cows.

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Characteristics, Curve and Persistency of Lactation in Gir Cows

Cited by 2 publications

References 0 publications

Relationships Between Partial Milk Yield and Actual Milk Yield According to Parity in Buffaloes

Relationships Between Partial Milk Yield and Actual Milk Yield According to Parity in Buffaloes

Relationship among thermal environment, stage of lactation, body characteristics, yield and milk constituents of dairy Gyr cows managed on pasture

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