Changes in the live weight of cows with age and its impact on their productive qualities

Горелик, О. В.; Drobyshevsky, M.V.; Khramykh, O.V.; Larionova, S E

doi:10.1051/e3sconf/202125408024

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The cows are more prone to mastitis in the age of 4-5 years because the cows generally produce more milk within this age range than very young or in the older age (Parsons et al, 2021). The cows produce more milk until the 3 rd lactation, and the milk production gradually decreases after the 3 rd lactation, but this becomes noticeable after the 5 th lactation (Gorelik et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Prevalence and associated risk factors of bovine mastitis in Ashulia, Dhaka, Bangladesh

2022

Veterinaria

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Mastitis is a critical infectious disease of dairy cow throughout the world. Antibiotic treatment can cure the disease, but the cows will be unable to reverse their previous productive condition. Therefore, the identification of the possible risk factors and management of those factors is the only way to minimize the losses in the dairy sector. The present study was conducted to clarify the existing status of the disease and to find out the possible risk factors of the disease to adjust successful control measures. The result exhibited that 57% of cows in the study area were infected by mastitis. Of these, subclinical mastitis was predominant (85%) followed by clinical mastitis (15%). Most of the cows got an infection at 3.5 to 5 years of age, typically in the 1st lactation and during the early lactational stage (≤3 months). Principal component analysis and Pearson correlation matrix analysis revealed that extensive milk producers, intensive rearing system, improper hygiene during milking, new farms of unskilled farmers and poor physical condition of the cows showed positive association to mastitis. However, adaptation of the extensive or semi-intensive rearing system as well as washing hands and udders before and after milking using an antiseptic, together with proper training of the farmers on scientific dairy farming can reduce the prevalence of mastitis in the study area. This will be advantageous in decreasing antibiotic usage and lessening new antibiotic-resistant bacterial strains.

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Section: Discussionmentioning

confidence: 99%

Prevalence and associated risk factors of bovine mastitis in Ashulia, Dhaka, Bangladesh

2022

Veterinaria

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“…Along with the positive traits of Holstein cattle, which are expressed in high milk yield and enhanced suitability for machine milking, some certain problems have been revealed also. One of these problems is a reduction of cows productive longevity [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of kappa-casein genotype on milk yield of cows and on culling of cows

et al. 2022

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For production of milk the breeds of highly productive dairy cows of domestic and foreign selection are used. These breeds include the Black-and-white mottled breed, which makes up more than 51% of the total cattle herd in Russian Federation, and the Holstein breed, which share is more than 15% and is constantly increasing. It has been established that cows with different kappa-casein genotypes differ in usability of their milk for cheese production. The research of influence of kappa-casein genotype on milk yield capabilities of cows and the reasons for culling of cows is relevant and of interest nowadays. The biggest share of the herd consists of cows with AA genotype, and the least share, 3.8%, consists of the most favorable BB genotype cows. These cows feature higher milk yield. Though there was no significant difference between the milk yield of cows with genotype BB and genotypes AA and AB, but a tendency for BB genotype superiority was clearly observed. The higher milk yield determines a higher yield of nutrients with milk. The group with the AB kappa-casein genotype accounted for a greater share of culled cows in the first lactation period. The lower rejection rate was recorded in the group of BB genotype cows.

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Dynamics of Milk Productivity and Body Weight of Cows by Age and Periods of Lactation

Admina,

Admin,

Osypenko

2023

STBIAS

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The research was conducted on the farms of the Stepne State Enterprise and the Agroprogres Private Enterprise (stall housing) and on the dairy complex of the Kutuzivka State Enterprise (free housing). It was established that the shape of the lactation curve of first-borns significantly differed from the classical one during untethered confinement. The average daily milk yield reached a maximum at 3-4 months and almost did not decrease until the 7th month of lactation. In older cows, fertility increased and reached a maximum at 2-3 months of lactation, and then gradually decreased. The relative increase in milk yield in comparison with the first month of lactation was 31% in first-born cows, 17% in second-calving cows, 7% in third-calving cows, and 18% in older animals, and in stall housing – 33%, 17%, 10 % and 2 %, respectively. The power of influence (η2) of the month of lactation on the fat content in milk during untethered confinement was 8.5% in first-born cows, 14.5% in the second lactation, 13.1% in the third lactation, 12.2% in older cows, and for tethered confinement 14.8%, 36.9%, 33.6%, and 11.6%, respectively (р<0.001). Similar to the fat content in milk, the protein content of cows also changed during lactation. At the same time, the influence of the month of lactation on this indicator was much smaller than on the fat content, and in some cases it was improbable for stall housing. The influence strength of the month of lactation on the daily yield of cows that were culled from the herd was 23.8% for free housing, 1.9% for body weight, and 8.0% for stall housing and 11.6 % (p<0.001). Correlation coefficients are 0.181, +0.411, and –0.223, +0.335, respectively (p<0.01). Age-related changes in the body weight of animals depended on the technology of their husbandry. In free housing, it was higher both in the sample as a whole (6%) and in animals of different lactations (3-14%). The increase in body weight of cows with age in free housing was: 31 kg in the second lactation, 71 kg in the third lactation, and 100 kg in adult cows, while in stall housing these differences were only 6, 11, 35 kg, respectively. Keywords: husbandry technology, dairy cattle, age, month of lactation, daily yield, fat content, protein content, body weight

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Changes in the live weight of cows with age and its impact on their productive qualities

Cited by 3 publications

References 10 publications

Prevalence and associated risk factors of bovine mastitis in Ashulia, Dhaka, Bangladesh

Prevalence and associated risk factors of bovine mastitis in Ashulia, Dhaka, Bangladesh

Influence of kappa-casein genotype on milk yield of cows and on culling of cows

Dynamics of Milk Productivity and Body Weight of Cows by Age and Periods of Lactation

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