scholarly journals Effect of Days Open on the Lactation Curve of Holstein Cattle in Saudi Arabia

2000 ◽  
Vol 13 (3) ◽  
pp. 277-286 ◽  
Author(s):  
A. K. A. Ali ◽  
A. Al-Haidary ◽  
M. A. Alshaikh ◽  
M. H. Gamil ◽  
E. Hayes
Keyword(s):  
Saudi Arabia ◽  
Holstein Cattle ◽  
Lactation Curve ◽  
Days Open

Effect of season on superovulatory responses and embryo quality in Holstein cattle in Saudi Arabia

1987 ◽  
Vol 27 (1) ◽  
pp. 231 ◽  
Author(s):  
I. Gordon ◽  
M.P. Boland ◽  
H. McGovern ◽  
G. Lynn
Keyword(s):  
Saudi Arabia ◽  
Embryo Quality ◽  
Holstein Cattle

scholarly journals Milk Yield, Reproduction and Milk Quality Characteristics of Simmental and Red-Holstein Cattle Raised in a Dairy Farm in Aydın Province: 1. Reproduction and Milk Yield

2020 ◽  
Vol 8 (10) ◽  
pp. 2068-2073
Author(s):  
Atakan Koç ◽  
Çağrı Arı
Keyword(s):  
Milk Yield ◽  
Dairy Farm ◽  
Quality Characteristics ◽  
Gestation Length ◽  
Peak Time ◽  
Holstein Cattle ◽  
Yield Traits ◽  
Lactation Length ◽  
Days Open ◽  
Fertility Traits

In this study, fertility and milk yield characteristics of Simmental (SIM) and Red-Holstein (RH) cattle raised in a private dairy farm in Aydın province were determined. For fertility traits, days open (DO), calving interval (CI), gestation length (GL) and number of inseminations per pregnancy (NIPP), for milk yield traits lactation length (LL), lactation milk yield (LMY), 305-days milk yield (305-dMY), peak time (PT) and peak milk yield (PMY) were determined. The means of DO, CI, GL and NIPP of RH and SIM breeds were 109.44±5.66 d and 96.06±3.51 d, 389.16±5.70 d and 380.37±3.54 d, 279.71±0.469 d and 284.94±0.303 d, 1.88±0.099 and 1.85±0.065; the means of LL, LMY, 305-dMY, PT and PMY were 333.00±5.405 d and 322.72±3.233 d, 8235.32±148.099 kg and 7357.03±88.122 kg, 7628.78±109.148 kg and 6938.09±64.945 kg, 46.55±2.196 d and 44.46±1.218 d, and 34.68±0.567 kg and 31.47±0.314 kg, respectively. Although, significant fertility and milk yield differences were obtained between the breeds, the favorable performances of both SIM and RH breeds in terms of all features, considered as the environmental factors such as management-feeding-housing-herd management provided to animals in the farm were also suitable.

9 EVALUATION OF FERTILITY TRAITS OF HOLSTEIN CATTLE IN ARGENTINA

2011 ◽  
Vol 23 (1) ◽  
pp. 111 ◽  
Author(s):  
F. A. Di Croce ◽  
A. M. Saxton ◽  
D. Casanova ◽  
F. N. Schrick
Keyword(s):  
Pregnancy Rate ◽  
Fixed Effects ◽  
Genetic Parameter ◽  
Genetic Correlations ◽  
The United States ◽  
Holstein Cattle ◽  
Calving Interval ◽  
Genetic Trend ◽  
Days Open ◽  
Fertility Traits

Impaired fertility is the primary reason for culling in the United States (26.5% of all disposals) and fertility rates have steadily declined during the past 30 years. The objectives of this study were 1) estimate genetic parameters and evaluate genetic correlations for fertility traits based on data from milk recording programs, and 2) evaluate genetic fertility trends in Holstein cattle in Argentina. Data representing 3 282 843 lactations and 1 622 088 animals (cows and bulls from 1936 to 2007) were used for the analysis and obtained from official records maintained by the Argentinean Holstein Association (ACHA). Lactations were standardized to 305 DIM for milk, protein, and fat. Days open (DO), calving interval (CI), age to first calving (AFC), and daughter pregnancy rate (DPR) were selected for genetic parameter estimation. Daughter pregnancy rate was calculated as described by (Kuhn et al. 2004 J. Dairy Sci. 87, 2277–2284). Animal models by lactation for each fertility trait included contemporary group (dairy herd and calving year), calving month, animal effect, milk production as a covariate, and error term. Multiple-trait derivative-free restricted maximum likelihood (MTDFREML) was used to estimate covariance components. Solutions for fixed effects, breeding values, and sampling variances (accuracies) were obtained for each trait. The fertility index ($F = –0.28 × AFC ± 4.9 × CI) was calculated using the economic rates as reported by (Gonzalez-Recio et al. 2004 J. Dairy Sci. 87, 3053–3061). First lactation/parities were utilised for estimating correlations among BLUPs for DO, CI, DPR, AFC, and $F. In general, moderate and high genetic correlations were observed (from 0.238 to 0.999; P < 0.001). Days open and calving interval showed high negative associations with DPR (–0.999, –0.648) and $F (–0.612, Q0.981). Results from the correlation analysis suggest that CI and $F are qualified indicators of fertility in lactating dairy Holstein and relate well with all the other traits. The index, $F, benefits by including AFC as a measure of initial reproductive efficiency followed by the inclusion of CI which measures success of inseminations. Genetic trend for AFC showed a decrease of 2.76 days per year between 1970 and 2000 for sires. Similarly, trends for CI resulted in decreases of 0.45 days per year between 1970 and 2000 for sires. During the same period, DPR increased by 0.02 percent per year in sires. Using current dollars values, $F increased 2.99 dollars per year for sires. Results indicate progress in the genetic trend for fertility traits in the Holstein population of Argentina, with higher improvement in sires compared with dams. Trends visually showed faster improvement after 1980, possibly due to extensive importation of US and Canadian bulls and semen (72% of bulls born after 1986) and selection for productive life introduced in 1993. Supported by Asociacion Criadores de Holando Argentino (ACHA).

COMPARISON OF TWO MATHEMATICAL MODELS IN FITTING LACTATION CURVES FOR PURELINE AND CROSSLINE DAIRY COWS

1986 ◽  
Vol 66 (2) ◽  
pp. 405-414 ◽  
Author(s):  
T. R. BATRA
Keyword(s):  
Genetic Variation ◽  
Dairy Cows ◽  
Genetic Improvement ◽  
Polynomial Function ◽  
Genetic Effects ◽  
Polynomial Functions ◽  
Lactation Curve ◽  
Open Line ◽  
Days Open ◽  
Effect Of Age

Weekly milk yield of 2066 first, 1407 second, and 755 third lactation pureline and crossline cows was used to study environmental and genetic effects on the coefficients of the lactation curves derived by modified gamma and inverse polynomial functions. The inverse polynomial function provided a better fit than the modified gamma function based on comparison of R2 values. Coefficients of the two models were analyzed to evaluate environmental and genetic effects on the shape of the lactation curve. The model included station, year of calving, month of calving, age at calving, days open, line of sire, line of dam, interaction of line of sire with line of dam, and sires within line of sire. In addition, coefficients of the lactation curve were analyzed by another model which included station, year of calving, month of calving, age at calving, days open, breed additive, maternal, and heterosis effects. Effects of station, year of calving, month of calving, and days open were mostly significant (P < 0.05); however the effect of age at calving was not significant on the coefficients of the lactation curves. Significant (P < 0.05) line of sire and line of dam effects on the level of initial yield suggest that genetic improvement of this trait could be achieved through selection. Breed additive and maternal effects were mostly nonsignificant on the coefficients of the lactation curves indicating shape of the lactation curve could not be changed by selection. There was very little evidence of nonadditive genetic variation associated with the coefficients of lactation curves. Key words: Lactation curves, pureline, crossline, dairy cows

scholarly journals The influence of multiple births on subsequent production and reproduction traits in Holstein cattle

2010 ◽  
Vol 58 (5) ◽  
pp. 43-48
Author(s):  
Jiří Bezdíček ◽  
Jan Říha
Keyword(s):  
Somatic Cell ◽  
Cell Count ◽  
Milk Production ◽  
Somatic Cell Count ◽  
Breeding Value ◽  
Multiple Births ◽  
Holstein Cattle ◽  
Reproduction Traits ◽  
Days Open ◽  
Lower Production

The aim of this study was to evaluate production and reproduction parameters after the birth of twins in holstein cattle (H = 100 %). Evaluation was made in terms of days open (the period between calving and conception; DO), milk production (kg of milk; % of fat, protein and lactose; kg of fat and protein; somatic cell count) and frequence of culling after the birth of twins. Milk production following the birth of twins was compared with milk production in controls matched on characteristics such as identical father, mother reaching the same breeding value of milk kg (± 10 %), evalued lactation occurring on the same farm, in the same year and period (±3 months). The goal was to pairs cows as cohorts with similar origins and production parameters under the same conditions and time. Days open after twinning in the multiple births were compared with days open in previous lactation and also with their cohorts. The data were analysed for 196 Holstein cows which gave birth to twins. The results showed a significantly (P ≤ 0.05) longer number of days open for the twin births. The prolongation was an average of 19 days. Days open through twin births was 132.62 days (sx = 62.22); in the previous lactation it was 113.54 days (sx = 63.14) and in cohorts 113.00 days (sx = 50.57). Milk production was similar in cows with twins and in cohorts (7907; 7871 kg). Average fat, protein and lactose percent in lactation was insignificantly lower in cows with twins (reduction: −0.08; −0.05; −0.02 %). Fat, protein and lactose percent was as follows in the group with twins compared to cohorts (3.72 vs. 3.80; 3.33 vs. 3.38; 4.94 vs. 4.96 %). From this arose an insignificantly lower production in kg of fat and protein (291.14 vs. 297.13; 261.49 vs. 264.74 kg). In the first three milk yield control after multiple births was found an insignificantly lower somatic cell count than in controls (149,7 thousand vs. 188.87 thousand). Frequence of culling after twin births (196 cows = 100%) were on health and reproductive grounds 78 cows (39.8 %) and for other reasons, 15 cows (7.65 %).

scholarly journals REPRODUKSI SAPI PERAH FRIESIAN HOLSTEIN PADA BERBAGAI PERIODE LAKTASI

2018 ◽  
Vol 6 (1) ◽  
pp. 89
Author(s):  
Ali Mahmud ◽  
Woro Busono ◽  
Puguh Surjowardojo
Keyword(s):  
Dairy Cattle ◽  
Reproductive Performance ◽  
Holstein Cattle ◽  
Calving Interval ◽  
Lactation Period ◽  
Earned Value ◽  
Significant Difference ◽  
C Value ◽  
Days Open

The purpose of this research is to compare the efficiency of reproductive performance Friesian Holstein (FH) in various lactation periods. The material used in this research is obtained from the records of reproductive performance Friesian Holstein (FH) cattle from Australia and has been developed in PT. Greenfield Indonesia farm. Datas were using 473 heads dairy cattle these were 100 heads for each lactation period I up to IV and 73 heads for lactation period V. The variable measured were efficiency of reproductive include service per conception (S/C); days open (DO) and calving interval (CI). The datas were analyzed using Completely Randomize Design one-way analyzes of variance (one way lay out) and if the result showed differences, the research will be continued using Least Significant Difference (LSD). The results showed that the higher lactation period of dairy cattle the greater the S/C, DO and CI (P<0.01). In lactation period I and II earned S/C value 2.6±1.3 and 2.1±1.1 were lower than lactation period III, IV and V which earned value 3.7±2.0; 4.2±2.1 and 4.1±2.3. DO in lactation I and II as118.3±49.7 days and 97.6±35.1 days were lower than lactation period III, IV, and V is 153.5±65.8 days;  168.2±81.5 days and 59.2±74.7 days. The lower CI was in period lactation II 365.8±36.9 days compared with lactation period III, IV  and V as 393.8±54.5 days; 406.1±78.3 days and 401.3±65.1 days. Conclusion of this research was lactation period has an effect on the performance of FH dairy reproduction, the higher of lactation period would increase S/C, DO and CI. Keywords : Calving Interval, Days Open, Friesian Holstein Cattle, Lactation Period, Service Per Conception.

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