scholarly journals EFFECT OF AGE AT FIRST CALVING AND FIRST LACTATION MILK YIELD ON PRODUCTIVE LIFE TRAITS OF SYRIAN SHAMI COWS

2020 ◽  
Vol 57 (2) ◽  
pp. 81-87
Keyword(s):  
Milk Yield ◽  
Age At First Calving ◽  
Productive Life ◽  
Life Traits ◽  
Effect Of Age

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

2019 ◽  
Vol 19 (1) ◽  
pp. 189-200
Author(s):  
Anna Sawa ◽  
Kamil Siatka ◽  
Sylwia Krężel-Czopek
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Considerable Decrease ◽  
Age At First Calving ◽  
Productive Life ◽  
Active Population ◽  
Holstein Friesian ◽  
Effect Of Age ◽  
Friesian Cows

AbstractThe 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.

scholarly journals Factors affecting the functional length of productive life in Slovak Pinzgau cows

2008 ◽  
Vol 53 (No. 3) ◽  
pp. 91-97 ◽  
Author(s):  
G. Mészáros ◽  
J. Wolf ◽  
O. Kadlečík
Keyword(s):  
Milk Production ◽  
Linear Increase ◽  
Production Level ◽  
Proportional Hazard ◽  
Proportional Hazard Model ◽  
Age At First Calving ◽  
Factors Affecting ◽  
Productive Life ◽  
The Impact ◽  
Effect Of Age

A proportional hazard model was used to analyze the impact of the most important factors on the length of productive life in 44 796 Slovak Pinzgau cows. The calculations were carried out with Survival Kit 3.12. The milk production level within a herd was the most important factor. The relation between the milk production level and the culling risk was strongly non-linear. Cows with extremely low milk production (less than 1.5 standard deviations below average) had a 4.8 times higher culling risk than average cows. The culling risk for the highest yielding cows was about one half of the risk of average cows. In the first lactation the culling risk was highest at the beginning and decreased in the course of lactation whereas in subsequent lactations the culling risk was highest at the end of lactation. The risk decreased with parity. The effect of age at first calving did not have a large influence on the length of productive life, although a linear increase in culling risk was observed as the age at first calving increased. Cows from expanding herds were at lower risk to be culled compared to cows in herds of stable and decreasing size.

Effect of age at first calving and other non-genetic factors on longevity and production traits in Holstein cattle under Vojvodina Province condition, Serbia

2019 ◽  
Author(s):  
D. Kuèeviæ ◽  
S. Dragin ◽  
I. Pihler ◽  
K. Èobanoviæ ◽  
T. Papoviæ ◽  
...  
Keyword(s):  
Milk Yield ◽  
Genetic Factors ◽  
Fixed Effect Model ◽  
Production Traits ◽  
Age At First Calving ◽  
Effect Model ◽  
Calving Season ◽  
Novi Sad ◽  
Effect Of Age ◽  
Vojvodina Province

The effect of age at first calving (AFC) and various non-genetic factors i.e. season of calving, farm and system of housing on longevity and production traits were investigated. Longevity traits were studied using total lifetime (TL), length of productive life (LPL) and number of lactations (NL) while production was researched using lifetime milk yield (LMY). Data of 2037 Holstein dairy cows were provided by the main breeding organizations at the Faculty of Agriculture, University of Novi Sad. The average values and variability of examined traits as well as the effect of factors on longevity and production traits were investigated using fixed effect model by general linear model (GLM) procedure in software package Statistica 13. Results showed highly significant effect of the AFC, calving season and farm, on all studied longevity traits (P less than 0.01), while non- significant effect was expressed on lifetime milk yield (P greater than 0.05). The mean of AFC, TL, LPL, NL and LMY for Holstein cows were 27.3, 67.5, 40.2 months, 2.45 and 18798.0 kg, respectively. The maximum values of LPL, NL and LMY were noticed for cows with age at first calving before 23 months of age. The LPL ranged from 47.88 (AFC less than 23 m) to 35.84 m (AFC>29 m) and declined progressively when the AFC is increased, particularly in cows calving at more than 29 m.

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 Relationship between reproductive capacity and productive longevity of cow

2021 ◽  
pp. 167-174
Author(s):  
L. V. Kholodova
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Economic Benefit ◽  
Extended Period ◽  
Reproductive Capacity ◽  
Milk Productivity ◽  
Age At First Calving ◽  
Research Results ◽  
Productive Life ◽  
Economic Use

One of the most critical tasks of modern dairy farming is to extend the time of productive use of cows. Studies have shown that the studied herd’s economic benefit ranged from 1005 to 3693 days and averaged 1864. The lifetime milk yield of the cows averaged 20746 kg and lifetime milk fat was 735.4 kg. On the first day of economic use, 10.2 kg of milk was obtained, and on the first day of lactation, the figure was significantly higher at 20.8 kg. The most extended use period for a cow was found to be 1903 days. The average open days were 91-120 days. The highest lifetime productivity was obtained from this group of animals, which was 21909 kg of milk. A further reduction or increase in the length of open days was accompanied by a decrease in economic use and a decrease in the productive life of the cows. When open days were too long (more than 120 days), the productive life of the cows was reduced to 1875 days, and milk productivity was also reduced to 20562 kg of milk. According to the research results, the abundant lifetime life of cows increases with the duration of inter calving period from 11 to 13 months from 14939 to 26582 kg. It was found that productive life milk yield and milk fat decreased with a more extended period between calvings. The age of the first calving had no significant effect on the duration of economic use of the cows. Individuals with first calving at 30 months of age and more excellent than 1993.2 days were best on this trait. However, the highest productive life was shown by animals whose age at first calving was 26-27, 9 months.

scholarly journals The Effect of Age at First Calving and Calving Interval on Productive Life and Lifetime Profit in Korean Holsteins

2013 ◽  
Vol 26 (11) ◽  
pp. 1511-1517 ◽  
Author(s):  
Changhee Do ◽  
Nidarshani Wasana ◽  
Kwanghyun Cho ◽  
Yunho Choi ◽  
Taejeong Choi ◽  
...  
Keyword(s):  
Calving Interval ◽  
Age At First Calving ◽  
Productive Life ◽  
Effect Of Age

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.

scholarly journals Genetic Trend of Length of Productive Life in Holstein and Slovak Simmental Cattle in Slovakia

2019 ◽  
Vol 67 (5) ◽  
pp. 1227-1234
Author(s):  
Eva Strapáková ◽  
Peter Strapák ◽  
Juraj Candrák
Keyword(s):  
Survival Analysis ◽  
Milk Yield ◽  
Weibull Model ◽  
Genetic Evaluation ◽  
Genetic Trend ◽  
Age At First Calving ◽  
Productive Life ◽  
Simmental Cattle ◽  
Year 2000 ◽  
Holstein Population

National genetic evaluation of lengh of productive life in Slovakia was carry out from the year 2014 till 2018, three times per year (March, June and October). The survival analysis was performed using Weibull sire model. The heritability obtained from Weibull model was different between populations (0.13 in Holstein and 0.05 in Slovak Simmental, respectively). RBVs of Holstein sires born up to 1999 shows decreasing tendency in all five years. A desirable tendency started from the year 2000. Differences between RBV in particular years are due to descent censored records during the evaluated period. Similar trends showed in Slovak Simmental bulls RBVs. Culled cows reached average 305-day milk yield 6499 kg and 4645 kg in Holstein and Slovak Simmental breeds, respectively. The length of productive life there was 898 days in Holstein and 985 days in Slovak Simmental cows. Age at first calving reached 930 days in Slovak Simmental and 851 days in Holstein heifers. The progress of both traits in the years 2014–2018 was lower in Holstein population, +288 kg milk and +76 productive days than in Slovak Simmental cows.

Sign in / Sign up

Export Citation Format

Share Document