Influence of Age at First Calving on Milk Quantity at Holstein-Friesian Cows

Shindarska, Zapryanka; Popov, Georgi; Ralchev, I.

doi:10.20546/ijcmas.2016.503.031

Int.J.Curr.Microbiol.App.Sci

2016

DOI: 10.20546/ijcmas.2016.503.031

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Influence of Age at First Calving on Milk Quantity at Holstein-Friesian Cows

Zapryanka Shindarska¹,

Georgi Popov²,

I. Ralchev³

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Cited by 2 publications

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Influence of the age of first insemination and first calving in Holstein – Friesian heifers on farm economic efficiency

Stankov¹

2020

AST

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Abstract. The present study aims to assess the influence of the age of first insemination and first calving in Holstein-Friesian heifers on the cost of breeding and the cost of their marketing as breeding animals. For this purpose, a study was conducted on 7 farms (A, B, C, D, E, F, G) situated in Central and Southern Bulgaria in which Holstein-Friesian cattle are bred. The results of the study indicated that the age of first insemination in the controlled farms was 17.2 months on average, and the age of first calving (AFC) was 26.6 months, which was within the established norms for the Holstein-Frisian breed raised in the country. The heifers from farm A, which entered breeding age the earliest (at 16 months), as well as the age of first calving (25.3 months) had the longest utilisation period – 4.9 lactations. However, they did not develop the highest milk yield either and the economic performance from their raising was low. The heifers on farm F, with age of first insemination of 17.3 months, and first calving age of 26.8 months, and the ones from farm G, with ages 17.4 and 26.6 months, respectively, developed maximum milk yield per lactation. The expenses for raising a heifer of the Holstein-Frisian breed varied from BGN 1922 up to BGN 2389, with an average sum of cost for the studied farms amounting to BGN 2123. This indicated that the raising of heifers from a high-yield breed was an expensive undertaking, but when taking the necessary care for their breeding at a younger age during the period of use they developed higher milk productivity.

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Influence of the age of first insemination and first calving in Holstein – Friesian heifers on farm economic efficiency

Stankov¹

2020

AST

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Effect of Age at First Calving on First Lactation Milk Yield, Lifetime Milk Production And Longevity of Cows

Sawa

Siatka

Krężel-Czopek

2019

Annals of Animal Science

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The objective of the study was to analyse the effect of age at first calving (AFC) on first lactation milk yield, lifetime milk production and longevity of dairy cows. The study used SYMLEK data on the milk yield and culling of 111 857 Polish Holstein-Friesian cows from the active population in Pomerania and Kujawy, Poland. The cows first calved during 2000–2009 and were used or removed from the herds until the end of 2015. For each cow, calculations were made of first lactation milk yield, lifetime milk production, first lactation milk yield per milking day, lifetime milk production per day, as well as the lifespan (length of productive life, duration of rearing) and number of calvings. Based on the age at first calving (duration of the rearing period), the cows were grouped as follows: ≤22, 22.1–24.0, 24.1–26.0, 26.1–28.0, 28.1–30.0, 30.1–32.0 and >32 months. The GLM, CORR PEARSON and FREQ procedures from the SAS package were used in the statistical calculations. Considering first lactation milk yield, lifetime milk production and longevity, it is recommended that the cows should be first milked between 22.1 and 26.0 months of age. This is supported by the approximately 24% higher lifetime milk production in relation to the latest calving cows (P<0.01). Late commencement of the first milking (especially after 28 months) causes a considerable decrease in the first lactation milk yield and lifetime milk production, shortens the productive period, reduces the number of calvings, and increases culling rate due to low milk yield and udder diseases.

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Influence of Age at First Calving on Milk Quantity at Holstein-Friesian Cows

Cited by 2 publications

References 6 publications

Influence of the age of first insemination and first calving in Holstein – Friesian heifers on farm economic efficiency

Influence of the age of first insemination and first calving in Holstein – Friesian heifers on farm economic efficiency

Effect of Age at First Calving on First Lactation Milk Yield, Lifetime Milk Production And Longevity of Cows

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