Short Communication: Changes in the Association Between Milk Yield and Age at First Calving in Holstein Cows with Herd Environment Level for Milk Yield

Ruiz-Sánchez, R.; Blake, Robert W.; Castro-Gámez, H.M.A.; Sánchez, Fausto; Montaldo, Hugo H.; Castillo‐Juárez, Héctor

doi:10.3168/jds.2007-0156

Cited by 26 publications

(28 citation statements)

References 32 publications

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“…The phenotypic correlations between AFC and milk yield were very small and negative (−0.05). It is in accordance with other studies in which AFC and milk yield were estimated as small and negative (−0.20 to −0.09) (Ruiz-Sánchez et al, 2007;Ojango and Pollott, 2001;Nilforooshan and Edriss, 2004). However, Teke and Murat (2013) reported the moderate positive correlation between AFC and milk yield (r = 0.32; P<0.001).…”

Section: Resultssupporting

confidence: 75%

“…Age at first calving determines the beginning of the cow's productive life and influences it's lifetime productivity (Ojango and Pollott, 2001). Ojango and Pollott (2001) and Ruiz-Sánchez et al (2007) indicated that earlymaturing heifers were better milk producers. According to Hoffman (1997) calving at less than 22 month of age had a negative influence on milk yield.…”

Section: Resultsmentioning

confidence: 99%

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Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle

Sitkowska¹,

Piwczyński²,

Lach³

et al. 2015

j. cent. eur. agric.

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The aim of this study was to identify the relationship between the lifetime performance of cows and their performance during the first 100 days of lactation. The studied material consisted of breeding documentation for 2,347 Holstein-Friesian cows, that were used for milk production between 1995 and 2010, in the Pedigree Breeding Centre in Osięciny. Such parameters as milk yield, fat (kg, %) and protein content (kg, %) were taken into consideration while analysing the results for the first 100 days of lactation and the lifetime milk performance. The study included only animals that had already been culled. Results indicate that the factors affecting the primiparas milk production during the 100-day lactation are as follows: herd, year and season of first calving as well as the age at first calving. It was proven that the sources of variation in the lifetime performance, in terms of the milk yield, fat and protein content, were: herd, year of first calving, age at first calving and the level of milk yield during the first 100 days of primiparas lactation. It was observed that the season of first calving did not significantly affect milk performance traits throughout the cows productive life. The calculated correlation coefficients, mainly of weak relationship between levels of the lifetime performance and the 100-day performance, showed a moderate positive correlation between the percentage content of fat and protein in milk in both periods.Keywords: age at first calving, lifetime performance, predicting, primiparas StreszczenieCelem badań było określenie związku między poziomem wydajności życiowej krów oraz ich wynikami w ciągu pierwszych 100 dni laktacji. Badanie przeprowadzono na podstawie dokumentacji hodowlanej dotyczącej 2,347 krów holsztyńsko-fryzyjskich, które były użytkowane mlecznie w latach 1995 -2010, w Ośrodku Hodowli Zarodowej w Osięcinach. Zebrano informacje dotyczące produkcyjności mleka, tłuszczu (kg,%) i białka (kg,%). Wzięto pod uwagę wyniki z pierwszych 100-dni laktacji i wydajności życia. Do badania włączono tylko zwierzęta, które zostały już wybrakowane ze stada. Analizy wykazały, że czynnikami wpływającymi na poziom cech mleczności pierwiastek, podczas laktacji 100-dniowej, były: stado, rok pierwszego wycielenia, sezon pierwszego wycielenia oraz wiek pierwszego wycielenia krów. Udowodniono, że źródłem zmienności użytkowości życiowej w zakresie wydajności mleka, tłuszczu i białka były stado i rok pierwszego wycielenia, wiek pierwszego wycielenia oraz poziom wydajności mlecznej podczas pierwszych 100-dni laktacji pierwiastek. Stwierdzono, że sezon pierwszego wycielenia nie wpłynął znacząco na poziom cech mleczności w całym okresie produkcyjnym krów. Obliczone współczynniki korelacji, na ogół o słabych zależnościach między poziomem wydajności 100-dniowych i życiowych, wykazały umiarkowane dodatnie zależności między procentową zawartością tłuszczu i białka w mleku w obu badanych okresach.Słowa kluczowe: pierwiastki, przewidywanie, wiek pierwszego wycielenia, wydajność życiowa Detailed ...

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle

Sitkowska¹,

Piwczyński²,

Lach³

et al. 2015

j. cent. eur. agric.

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show abstract

“…Estimates for US Holsteins (0.03) (Cole & Null, 2010) and for Canada (0.09) (Jamrozik et al 2005) were also small, but not as small. Larger estimates above 0.20 were obtained in studies with different dairy breeds (e.g., Ruiz-Sánchez et al 2007). It is worth mentioning, however, that many of the estimates for this trait have been obtained with models lacking a sire-herd effect.…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters for milk yield and reproduction traits in the Chilean Dairy Overo Colorado cattle breed

Montaldo¹

2017

Ciencia e investigación agraria

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The objective of this study was to estimate genetic parameters for milk production and reproduction traits using phenotypic and pedigree information from the Dairy Overo Colorado breed from southern Chile. Single-and multi-trait mixed models were used to analyze the data. Analyses were performed using ASReml software. The heritability estimates for milk yield, fat yield, protein yield, fat content, protein content, age at first calving and calving interval were 0.29 ± 0.04, 0.34 ± 0.04, 0.30 ± 0.04, 0.56 ± 0.04, 0.56 ± 0.04, 0.01 ± 0.07 and 0.002 ± 0.02, respectively. The genetic correlations between yield traits were high and positive (≥ 0.81). The genetic correlations of milk yield with fat content (-0.32) and protein content (-0.34) were unfavorable. The genetic correlation estimates between age at first calving and yield traits were negative, ranging between -0.71 and -0.29. The phenotypic correlations between calving interval and milk yield traits were slightly positive (0.06-0.09), suggesting a weak relationship between reproduction and yield in this population. Genetic variation was significantly greater than zero for milk production traits. Genetic improvement for age at first calving and calving interval may be slow because small differences between animals and low reliabilities are expected for estimated breeding values for these traits due to heritabilities close to zero. The design of an efficient breeding program for yield traits based on artificial insemination for this population is feasible using either progeny testing or genomic breeding value prediction to select sires.

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“…AFC in the present study was shorter than 47 months for crossbred cattle Amhara region as reported by Solomon et al (2009). Age at first calving have an impact on the productive life span of the cows and rearing cost of the dairy animals (Ruiz-Sanchez et al, 2007).…”

Section: Milking Productive and Reproductive Performance Of Dairy Cowsmentioning

confidence: 99%

Socio-economic characteristics of dairy production in the selected areas of Ethiopian central highlands

Bereda¹,

Yilma²,

Eshetu³

et al. 2017

J. Vet. Med. Anim. Health

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A study was carried out to assess dairy production practices in eight selected areas of the Ethiopian central highlands. Overall, 320 smallholder farmers (40 from each of 8 study sites) were randomly selected for individual interviews using a semi-structured questionnaire. Dairying (43%) was reported to be a major source of income for farm household. The major feed sources for dairy cattle includes grazing on natural pasture (62%), grass hay (94%), crop residues of barley (57%) and wheat (53%). Mastitis (66%), blackleg (18%) and foot and mouth disease (10%) were the most common dairy cattle health problems. On average, 1,977 Ethiopian birr was estimated for milk disposed from infected udders and cost of medication against various animal diseases per household/year. Artificial insemination and natural mating using genetically improved bulls were the two breeding methods for dairy animals. The average charges of artificial insemination and bull services were estimated to be 29 and 81 birr, respectively. The average milk yield per cow was 10 liters/day. Milking was dominantly done by housewives twice a day. Average calving interval (14 months), age at first calving (31 months), and lactation length (9.4 months) was reported for crossbred cows. The major dairy production constraints identified in this study were shortage of feed, poor nutritional quality, high veterinary cost and shortage of veterinary clinics and veterinarians. Thus it is recommended that there is a need to conserve feed, introduce improved forage species and improve animal health services, which will enhance the productivity and profitability of the dairy sector in the study areas.

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Short Communication: Changes in the Association Between Milk Yield and Age at First Calving in Holstein Cows with Herd Environment Level for Milk Yield

Abstract: about the complexity of genetic association and genotype × environment interactions between AFC and MY.

Cited by 26 publications

References 32 publications

Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle

Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle

Genetic parameters for milk yield and reproduction traits in the Chilean Dairy Overo Colorado cattle breed

Socio-economic characteristics of dairy production in the selected areas of Ethiopian central highlands

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