scholarly journals Effect of age at first calving on longevity and fertility traits for Holstein cattle

2013 ◽  
Vol 58 (No. 2) ◽  
pp. 47-57 ◽  
Author(s):  
L. Zavadilová ◽  
M. Štípková
Keyword(s):  
Linear Model ◽  
Missing Values ◽  
Holstein Cows ◽  
Age At First Calving ◽  
Age Class ◽  
Reproduction Traits ◽  
High Age ◽  
Days Open ◽  
Fertility Traits ◽  
Effect Of Age

Effects of age at first calving (AFC) on functional longevity of Czech Holstein cows and their reproduction traits in the first lactation were analyzed using the first lactation data of 605 538 Holstein cows first calved from 1993 to 2008. Three classes were formed for AFC: low age class (16–24 months), average age class (25–30 months), and high age class (33–46 months). Effects of AFC on length of productive life (LPL), days open (DO), days between calving and first service (CTFS), and days between first service and conception in the first lactation (FSTC) were estimated by survival and linear model analyses. It was found that LPL was on average slightly shorter for cows with higher AFC who showed also a lower proportion of higher lactations and tended to longer DO and longer CTFS in the first parity. The results of survival analysis indicate that cows with higher AFC had a tendency to shorter LPL (risk of culling 1.118) and to longer DO (risk of conception 0.758), CTFS (risk of conception 0.757), and FSTC (risk of conception 0.754) in comparison with cows with lower AFC. When the effect of fertility traits on LPL was analyzed, it was found that longer DO, CTFS, and FSTC were connected with a lower risk of culling (0.132, 0.183, 0.206) regardless of the particular AFC group. In linear model analysis, the effects of AFC group were estimated from two datasets, where the second dataset included also the missing values of fertility traits. It was found that the cows group with the highest AFC showed worse values of fertility traits (16.75, 19.69, 20.46 days) than the cows groups with lower AFC. Results of all analyses showed that a high AFC is connected with worse cow’s fertility at the first lactation and with lower cow’s LPL.    

scholarly journals Relationship Between Age at First Calving and Longevity and Productive Life in Holstein Cows

2020 ◽  
Vol 68 (5) ◽  
pp. 867-874 ◽  
Author(s):  
Vladislav Valchev ◽  
Ivaylo Marinov ◽  
Teodora Angelova
Keyword(s):  
Holstein Cows ◽  
Age At First Calving ◽  
Productive Life ◽  
Average Longevity ◽  
High Age ◽  
One Year ◽  
First Time ◽  
Cattle Farms ◽  
Effect Of Age ◽  
Very High

The aim of the study was to evaluate the effect of age at first calving on functional traits – longevity and productive life in dairy cows. The survey included 1490 Holstein cows from 5 cattle farms in Bulgaria. The average milk yield per cow in the farms studied ranged from 6031.68 kg to 8660.37 kg. The average age at first calving was 29.68 months. The highest percentage of cows calved for the first time at age 28–30 months – 29.53%, generally 38.06% of cows calved for the first time at a very high age – over 31 months and only 7.58% calved aged up to 24 months. The average longevity for all culled cows was 6.05 years and the productive life – 3.63 years. 22% of all culled cows at these farms were culled before the end of their first lactation. The highest total longevity was in cows calved for the first time at high age – over 28 months. Cows calved for the first time, both at low age (up to 24 months) and at high age (over 37 months), had a shorter productive life of 4.0 and 3.9 years, respectively. Cows with the shortest productive life – one year and less – had and the highest average age at first calving of 30.21 months.

The relationships between performance traits and the bGH/Alu I and Pit-1/Hinf I polymorphisms in Holstein cows

2017 ◽  
Author(s):  
Memis Ozdemir ◽  
Mehmet Topal ◽  
Vecihi Aksakal
Keyword(s):  
Linear Model ◽  
Genetic Markers ◽  
Analysis Of Variance ◽  
Genetic Selection ◽  
General Linear Model ◽  
Holstein Cows ◽  
Production Traits ◽  
Milk Traits ◽  
Reproduction Traits ◽  
General Linear Model Procedure

Progress in genetic selection in livestock can be increased by marker asisted selection. The identification of favorable genetic markers is one of the most important stages in marker-asisted selection. In this study, it was aimed to determine the effects of the bGH/AluI and Pit-1/HinfI polymorphisms on the production traits of organic reared cows. Genotyping was performed on total 245 Holstein cows, n=181 for Pit-1 gene and n=186 for bGH gene. Milk yields and some reproduction traits analyzed by analysis of variance using the general linear model procedure, and 703 production records from cows were used to. The results showed that neither the Pit-1/Hinf I nor bGH/Alu I polymorphisms affect the tested milk traits (p>0.05).

scholarly journals Effect of Age at First Calving on First Lactation Milk Yield in Holstein Cows from Costa Rican Specialized Dairy Herds

2014 ◽  
Vol 04 (09) ◽  
pp. 197-203
Author(s):  
Mauren Salazar-Carranza ◽  
Gloriana Castillo-Badilla ◽  
Jaime Murillo-Herrera ◽  
Frank Hueckmann-Voss ◽  
Juan José Romero-Zúñiga
Keyword(s):  
Milk Yield ◽  
Costa Rican ◽  
Holstein Cows ◽  
Dairy Herds ◽  
Age At First Calving ◽  
Effect Of Age

scholarly journals Longevity traits of Shami and Holstein Cows in Syria

2021 ◽  
Author(s):  
Obaida Abdel Kareem Almasri ◽  
Samy Abou-Bakr ◽  
Mohammed A. M. Ibrahim ◽  
Mohamed A. A. Awad
Keyword(s):  
Linear Model ◽  
Milk Production ◽  
Land Reclamation ◽  
General Linear Model ◽  
Least Square ◽  
Management Policy ◽  
Holstein Cows ◽  
Daily Milk Production ◽  
Effect Of Age ◽  
Daily Milk

Abstract This research aimed to study the effect of age at first calving (AFC) and first lactation milk yield (FLMY) on the longevity traits of Shami and Holstein cows under the Syrian environment and estimate longevity traits for both breeds. The complete records from birth to voluntary culling were collected for 569 Shami cows and 1699 Holstein cows during the period from 1982 to 2014 at two experimental stations, Ministry of Agriculture and Land Reclamation, Syria. Data were analyzed using the General Linear Model (XLSTAT, 2020). The least square means of lifespan (LS), productive life (PL), a number of calvings (NC), lifetime milk production (LMP), and lifetime daily milk production (LDMP) were 93.7±0.14 months, 63.2±34 months, 4.2±0.14, 7683±0.14 kg, 2.6±0.14 kg for Shami cows, respectively. The corresponding values for Holstein cows were: 61.9±0.14 months, 31.6±34 months, 2.6±0.14, 10246±0.14 kg, 4.4±0.14 kg, respectively. The effect of AFC was significant on all studied traits except LS trait. Whereas, FLMY effect was significant only on LMP and LDMP traits. It was concluded that Shami cows had longer LS, PL, NC traits than Holstein ones, but their LMP and DLMY were lower. Reduction of AFC for Shami and Holstein cows to less than or equals to 25 months could be a proper management policy to improve each of PL, NC, LMP and LDMY. FLMY was found as an indicator for LMP and LDMY of Shami and Holstein cows.

scholarly journals Effect of prepubertal and postpubertal growth and age at first calving on production and reproduction traits during the first 3 lactations in Holstein dairy cattle

2014 ◽  
Vol 97 (5) ◽  
pp. 3017-3027 ◽  
Author(s):  
L. Krpálková ◽  
V.E. Cabrera ◽  
M. Vacek ◽  
M. Štípková ◽  
L. Stádník ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Age At First Calving ◽  
Reproduction Traits

scholarly journals The Analysis of Reproduction in Population of the Slovak Spotted Dairy Cows

2019 ◽  
Vol 67 (6) ◽  
pp. 1419-1426
Author(s):  
Jozef Bujko ◽  
Juraj Candrák ◽  
Peter Strapák ◽  
Július Žitný ◽  
Cyril Hrnčár ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Fixed Effects ◽  
Linear Models ◽  
Correlation Coefficients ◽  
Calving Interval ◽  
Factors Affecting ◽  
Actual Computation ◽  
Reproduction Traits ◽  
Days Open ◽  
Basic Statistical Analysis

The aim of study was to analyse the reproduction and factors affecting on reproduction traits of dairy cows in population of Slovak Spotted cattle from 2007 to 2016 the results for 37,274 dairy cows: days to first service (DFS), days open (DO), number of inseminations per conception (NIC), age of first calving (AFC) and calving interval (CI). The basic statistical analysis were analysed using the SAS version 9.3. For the actual computation a linear models with fixed effects was used: For the actual computation a linear models with fixed effects was used: yijklm = μ + HYSi + BTj+ Fk+ Bl +eijklm. The linear model represents coefficients determination R2 = 0.452117% (P < 0.001) for DFS, R2 = 0.377715% (P < 0.001) for DO, R2 = 0.348442% (P < 0.001) for NIC and R2 = 0.317128% (P < 0.001) for CI with all fixed effects. Correlation coefficients among DFS with DO, NIC, AFC and CI were r = 0.37275, r = -0.06881, r = 0.06493 and r = 0.08348. These coefficients were highly statistically significant (P < 0.001).

scholarly journals Genetic parameters for female fertility and milk production traits in first-parity Czech Holstein cows

2012 ◽  
Vol 57 (No. 3) ◽  
pp. 108-114 ◽  
Author(s):  
V. Zink ◽  
J. Lassen ◽  
M. Štípková
Keyword(s):  
Milk Production ◽  
Genetic Parameters ◽  
Selection Index ◽  
Female Fertility ◽  
Holstein Cows ◽  
Production Traits ◽  
Milk Production Traits ◽  
Clear Trend ◽  
Genetic Potential ◽  
Fertility Traits

The aim of this study was to estimate genetic parameters for female fertility and production traits in first-parity Czech Holstein cows and to quantify the effect of using this information on the accuracy of a selection index in seven different scenarios. In order to estimate genetic (co)variance components, the DMU software running an AI-REML algorithm was used. The analyses were made using a series of bivariate animal models. The pedigree included 164 125 animals and it was set up using a pruned animal model design. The present study included the following female fertility traits for the first lactations: calving to the first insemination (CF), days open (DO), calving from the first to the last insemination (FL), and milk production traits: milk production (MLK), kg of fat (FAT), and kg of protein (PROT). The heritability for all the investigated fertility traits was low and close to 0. Moderate heritabilities for production traits ranging from 0.20 (MLK) to 0.23 (PROT) were estimated. The strongest unfavourable correlation was found between PROT and DO (0.49). Other estimated correlations between fertility traits and production traits were moderate, ranging from 0.26 to 0.41. The results of this study evidence that cows with the poorest genetic potential for reproductive performance are those having high genetic potential for milk production and milk components. The results also show that the number of days from calving to new pregnancy depends on the production level. Seven investigated scenarios using selection index theory show a clear trend for increasing accuracy when more fertility traits were added as well as when higher numbers of daughters with information on reproduction traits per sire were available. &nbsp;

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