scholarly journals Relationship Between Days Open and Cumulative Milk Yield at Various Intervals from Parturition for High and Low Producing Cows

1980 ◽  
Vol 63 (8) ◽  
pp. 1317-1327 ◽  
Author(s):  
P.A. Oltenacu ◽  
T.R. Rounsaville ◽  
R.A. Milligan ◽  
R.L Hintz
Keyword(s):  
Milk Yield ◽  
Days Open

The effects of days-open on milk yield and on breeding policy post partum

1979 ◽  
Vol 29 (1) ◽  
pp. 109-119 ◽  
Author(s):  
R. Bar-Anan ◽  
M. Soller
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Post Partum ◽  
Economic Value ◽  
Total Yield ◽  
Annual Production ◽  
Initial Yield ◽  
Days Open

ABSTRACTThe effects of days-open on milk yields in current lactations and in following lactations were estimated from 71 911 current and 68 693 following lactation records. Yields were expressed as 305-day, total and annual records, where annual record = 365 × (total yield/days between calvings).The data were grouped according to current days-open, corrected for initial yield differences and analysed separately for heifers and cows in Moshav (moderate-yielding) and Kibbutz (high-yielding) herds. Current 305-day records increased by 15 to 18 kg milk/day-open up to 90 days-open, and 2 to 3 kg/day-open thereafter. In contrast, the effects of increasing days-open on annual yields were generally small and negative, being positive only for heifers up to 90 days-open. Thus 305-day records heavily under-rated annual yields of fertile cows. For current lactations, 70 to 100 days-open for heifers and 30 to 50 days-open for cows resulted in the highest annual production. Yields in following lactations were positively associated with days-open in the previous lactation. The effect was highest in high-yielding herds, suggesting that high-yielding cows respond positively to some rest between calvings.Combining the effects of days-open on current and following lactation yields and on the calf crop: in high-yielding herds heifers had the highest productivity when mated not earlier than 70 days post partum, while in moderately-yielding herds days-open did not affect productivity. Cows in high-yielding herds achieved highest productivity at 41 to 90 days-open, while cows in moderately-yielding herds were most productive when mated as early as possible.A comparison of the economic value of sire fertility and sire transmitting ability for milk production showed that fertility may often be over-rated.

Effect of first 60-day cumulative milk yield on days open in Holstein dairy cows in Iran

2007 ◽  
Vol 2007 ◽  
pp. 148-148
Author(s):  
A. Heravi Moussavi ◽  
M. Danesh Mesgaran ◽  
T. Vafa
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Dairy Farm ◽  
Reproductive Efficiency ◽  
Root Cause ◽  
Principal Factors ◽  
Days Open ◽  
Holstein Dairy Cows

Reproduction and milk production are the principal factors that are influencing dairy farm profitability. The dairy industry in Iran has changed dramatically in the last decade. The shift toward more productive cows and larger herds in Iran is associated with a decrease reproductive efficiency (Heravi Moussavi et al., 2004). Increased knowledge about the principal causes of reduced fertility is essential. The root cause of the declining fertility is probably a combination of a variety of physiological and management factors that have an additive effect on reproductive efficiency. Dairy cattle are inseminated and pregnancy is established while dairy cows are lactating. Based on the analyses of large datasets, there is clearly an antagonistic relationship between milk production and reproduction in dairy cattle (Lucy, 2001). It was shown that the hazard ratio for cumulative first 60-day milk yield and conception in high producer cows was 8 percent less than the others and also high milk yield was a risk factor for several reproductive disorders (Grohn and Rajala-Schultz, 2000). The objective of this study was to evaluate the effect of first 60-day cumulative milk yield on days open in Iranian Holstein dairy cows.

scholarly journals Effect of concentrate supplementation during transition period on production and reproduction of indigenous buffalo

2020 ◽  
Vol 49 (1) ◽  
pp. 83-90
Author(s):  
MR Habib ◽  
MZ Islam ◽  
MS Bari ◽  
MZ Islam ◽  
MAH Sarker ◽  
...  
Keyword(s):  
Milk Yield ◽  
Transition Period ◽  
Post Partum ◽  
Mustard Oil ◽  
Control Group ◽  
Common Salt ◽  
Concentrate Supplementation ◽  
Heat Period ◽  
Days Open ◽  
The Impact

This study was to investigate the impact of concentrate supplementation on the growth, milk yield and quality, postpartum heat period and days open in transient buffalo. Hence, six selected indigenous transient buffaloes were equally divided into two groups viz. control (n=3) and supplemented (n=3). About 56.0 kg mixed green fodders (Para:German=3:1) and 2.0 kg concentrate mixtures were offered as a basal diet to each buffalo. Besides these, an additional amount (0.5 kg) of concentrate mixture (wheat bran-50%, mustard oil cake-40%, common salt-2% and di-calcium phosphate-8%) was supplied to each buffalo of the supplemented group. The dry matter intake of the supplemented buffalo was 2.5 and 2% higher (p<0.001) at pre- and post-partum period, respectively than that of the control fed buffalo. Pre- and post-partum body weight, and body condition score of buffaloes between the group were found similar (p>0.05). About 20% more (p=0.02) milk was obtained in the supplemented group compared to the control group, however, the milk composition was not different (p>0.05). Calf birth weight was found ≈10% higher (p=0.51) in the supplemented group than that of the control group. Postpartum heat period and days open of the supplemented buffaloes were reduced remarkably by 13 and 14 days, respectively compared to the buffaloes in control group. Overall, concentrate supplementation to the transient indigenous buffaloes has noteworthy effects on milk yield, postpartum heat period and days open. Bang. J. Anim. Sci. 2020. 49 (1): 83-90

77 REPRODUCTIVE PERFORMANCE OF DAIRY COWS DIFFERING IN THE INTERVAL FROM CALVING TO THE FIRST OVULATION IN THE POSTPARTUM PERIOD

2012 ◽  
Vol 24 (1) ◽  
pp. 151
Author(s):  
M. Yamaguchi ◽  
S. Takahashi ◽  
H. Koyama ◽  
O. Dochi
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Reproductive Performance ◽  
Postpartum Period ◽  
Body Condition Score ◽  
Early Recovery ◽  
Factors Affecting ◽  
Condition Score ◽  
Peripartum Period ◽  
Days Open

In recent years, reproductive performance of dairy cows has declined worldwide. The reproductive characteristics of dairy cows should be evaluated to improve their fertility. Dochi et al. (2010) had reported that dairy cows that exhibited early first ovulation gave a low milk yield, had an early recovery of body condition score (BCS) in the postpartum period and a shorter number of days open. The objective of this study was to evaluate the effect of BCS on the functional recovery of reproduction after the birth of the calves. In this study, lactating Holstein cows were placed in free-stall housing equipped with an automatic milking system. The data presented in this study were collected from 48 cows that had calved between December 2007 and October 2010 with an average parity of 3.4 (range 2–6). The reproductive performance and the BCS during the different intervals between calving and the first ovulation were analysed using ANOVA. The conception rate at the first service was 38.1%. The average milk yield (305 days) was 12 299 kg. The first ovulation and oestrus were determined by ultrasonography. The results of the different intervals to the first ovulation are presented in Table 1. The average interval from the start of days in milk (DIM) to the first ovulation, first oestrus and first service; the number of days open; the number of services per conception and the milk yield (kg day–1, by 90 DIM) were 37.4, 54.7 and 110.3 days; 168.2 days open; 2.5 times; and 42.1 kg day–1, respectively. The cows that exhibited early first ovulation (≤21 DIM) in the postpartum period had significantly shorter intervals between the start of DIM and the first oestrus (P < 0.01). However, the days to first service, the number of days open, the number of services per conception and the milk yield (kg day–1, by 90 DIM) did not differ significantly. The BCS in the peripartum period of different intervals to the first ovulation decreased from 3.1 to 2.4 by 150 DIM. This study showed that average BCS of preparturient 50–10 DIM is 3.0. Moreover, the average BCS of parturition is declining to 2.5 (parturition from 70 to 150 DIM). The cows became pregnant after an increase in the BCS (>150 DIM). In conclusion, these results suggest that the delay to the first ovulation in the postpartum period tended to have delayed the oestrus expression in the cows. Moreover, the low level of BCS in the peripartum period, regardless of the number of days of the first ovulation and the first oestrus, potentially influenced the prolongation in the number of days open. To improve the fertility of the cows, it is important to elucidate the factors affecting the fluctuations in the BCS during the peripartum period. Table 1.Reproductive performance of dairy cows differing in interval to postpartum first ovulation

THE EFFECTS OF DAYS DRY AND DAYS OPEN ON THE MILK AND BUTTERFAT PRODUCTION OF HOLSTEIN-FRIESIAN CATTLE

1967 ◽  
Vol 47 (1) ◽  
pp. 85-90 ◽  
Author(s):  
J. W. Wilton ◽  
E. B. Burnside ◽  
J. C. Rennie
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Holstein Friesian ◽  
Dairy Animals ◽  
Days Open ◽  
Friesian Cattle ◽  
Selection Of

The effect of days dry and days open on first, second and later lactation production was examined by intra-sire-herd-season regression. Neither variation in days dry nor days open accounted for more than 1% of the within-sire variance in fat test. Variation in preceding days dry accounted for 4.8% of the within-sire variance in milk production in second lactations but only 0.6% of the variance in later lactations. Differences in days open accounted for 4.5, 3.5, and 4.5% of the intra-sire variance in milk production in first, second, and later lactations, respectively. The effects of days dry and days open on fat production were, in all cases, slightly less than the effects on milk production. Heritabilities for both traits were low, indicating that the effects of both days dry and days open on production were largely of an environmental nature. Adjustment of milk yield for the number of days cows are open could lead to more accurate selection of dairy animals.

scholarly journals Prevalence of Ketosis Detected by an Electronic Cow Side Test and its Impact to Days Open on Dairy Cows

2021 ◽  
Vol 6 (2) ◽  
pp. 14-18
Author(s):  
Duricic Drazen ◽  
Bacan Iva ◽  
Samardzija Marko
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Artificial Insemination ◽  
Blood Concentration ◽  
Dairy Herds ◽  
Subclinical Ketosis ◽  
Caudal Vein ◽  
Days Open

The study aimed to resolve and confirm the previous results of subclinical and clinical ketosis prevalence in northwestern Croatia detected by an electronic cow side test and its impact on days open in dairy herds. Cows (N=559) 2-8 years old from 96 farms located in northwestern Croatia were included in the study. The average milk yield was 7327.80 ± 968.21 kg. The cows were classified into two separate groups: ketotic cows group KET (n=73) with BHBA blood concentration of ≥1.4 mmol/L, and negative NEG (n=486) group with serum BHBA level of <1.4 mmol/L. One droplet of blood from the caudal vein was collect from randomly selected cows in the period 7 to 15 days after parturition. BHBA level determined with Precision Xceed BHBA devices. The period from parturition to first insemination (days open to the first (artificial) insemination, DOFI) was shorter in NEG than in the POS group (110.56±10.65 days vs.114.82±12.23 days, respectively) such as period from parturition to successful conception (days open to successful conception, DOSC), (139.97±15.18 days vs. 127.99±15.87 days, respectively). The prevalence of clinical and subclinical ketosis was 15.02%. Ketosis significantly prolonged days open to first artificial insemination and days open to successful conception in cows from northwestern Croatia.

scholarly journals Genetic relationship of lactation persistency with milk yield, somatic cell score, reproductive traits, and longevity in Slovak Holstein cattle

2016 ◽  
Vol 59 (3) ◽  
pp. 329-335 ◽  
Author(s):  
Eva Strapáková ◽  
Juraj Candrák ◽  
Peter Strapák
Keyword(s):  
Somatic Cell ◽  
Milk Yield ◽  
Reproductive Traits ◽  
Somatic Cell Score ◽  
Calving Interval ◽  
Days Open ◽  
Selection For ◽  
Selected Traits ◽  
Relationship Of ◽  
The Relationship

Abstract. The objective of this study was to estimate the breeding values (BVs) of lactation persistency, the test day of milk yield, the somatic cell score, reproductive traits (calving interval, days open), longevity in Slovak Holstein dairy cattle. BVs were used for the detection of relationships among the persistency of lactation and other selected traits. Data for the estimation of BVs of milk production and somatic cell score were collected from 855 240 cows. BVs for reproductive traits were estimated for 352 712 cows and for longevity for 528 362 cows. The highest correlations were confirmed between the BV of persistency and the BV of test day milk yield at 100, 200, and 305 days (−0.88, −0.65, and −0.61). Correlations between the BV of lactation persistency and the BV of somatic cell score at day 305 or the BV of somatic cell score persistency were favorable: −0.05 and −0.12, respectively. The relationship between the BV of persistency and the BV of the calving interval or the BV of days open was 0.11 and 0.10 respectively. The selection for the persistency of lactation may not improve longevity because there is no relation between the BV of persistency and the BV of longevity (rg = 0.06).

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.

scholarly journals A Study on Milk Yield, Fertility and Milk Quality Characteristics of Primiparous Red-Holstein and Holstein-Friesian Cows

2020 ◽  
Vol 8 (12) ◽  
pp. 2562-2569
Author(s):  
Atakan Koç ◽  
Ramazan Gürses
Keyword(s):  
Milk Yield ◽  
Milk Quality ◽  
Gestation Length ◽  
Holstein Friesian ◽  
Significant Difference ◽  
Days Open ◽  
Daily Milk Yield ◽  
Daily Milk ◽  
Friesian Cows

The aim of this study was to determine the reproductive characteristics, milk yield and milk quality of Primiparous Red-Holstein (RH) and Holstein-Friesian (HF) cows. For this aim, records and monthly taken milk samples of 83 RH and 14 HF raised on a farm in Aydın, Turkey were used. The averages of the first calving age (FCA), gestation length (GL), days open (DO), calving interval (CI), daily milk yield (DMY), 305-day milk yield (305-dMY), solid non-fat (SNF) and Log10 somatic cell count (Log10SCC) of milk were found to be 27.6±0.24 mo, 278.4±1.09 d, 144.0±7.12 d, 421.4±7.66 d, 22.7±0.21 kg, 6981±137.0 kg, 9.8±0.04% and 4.59±0.024 (38905 cells/ml), respectively. Except for DMY, the differences between the breeds were statistically insignificant for FCA, GL, DO, CI, 305-dMY, SNF and Log10SCC. DMY averages for RH and HF were 21.8±0.21 kg and 24.3±0.49 kg, respectively. The effect of season on FCA and the effect of lactation month on SNF and Log10SCC were also found to be statistically significant. Apart from DMY, not any significant difference was observed between RH and HF breeds in terms of the characteristics emphasized.

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