Cartographie du Stress Thermique en Tunisie : Actualisation et Évaluation de l'Impact Sur les Performances des Vaches Laitière de Race Holstein = Thermal Stress Mapping in Tunisia : Updating and Evaluation of the Impact on the Performance of Holstein Dairy Cows = خارطة الإجهاد الحراري بتونس : تحيين و دراسة التأثير على إنتاجية الأبقار الحلوب

2016 ◽  
Vol 89 (Numéro Spécial) ◽  
pp. 179-182
Author(s):  
Mondher Ben Salem
Keyword(s):  
Thermal Stress ◽  
Dairy Cows ◽  
Stress Thermique ◽  
Stress Mapping ◽  
The Impact ◽  
Holstein Dairy Cows

scholarly journals The Impact of Season, Parity, and Volume of Colostrum on Holstein Dairy Cows Colostrum Composition

2017 ◽  
Vol 08 (07) ◽  
pp. 572-581
Author(s):  
Soheila Zarei ◽  
Gholam Reza Ghorbani ◽  
Mohammad Khorvash ◽  
O'Brien Martin ◽  
Amir Hossein Mahdavi ◽  
...  
Keyword(s):  
Dairy Cows ◽  
The Impact ◽  
Holstein Dairy Cows

scholarly journals Impact of calving interval on milk yield and longevity of primiparous Estonian Holstein cows

2020 ◽  
Vol 65 (No. 10) ◽  
pp. 365-372
Author(s):  
Aadi Remmik ◽  
Rando Värnik ◽  
Kalle Kask
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Interval Length ◽  
Holstein Cows ◽  
Calving Interval ◽  
Productive Life ◽  
The Impact ◽  
Holstein Dairy Cows

Data about 4 474 high-yielding Estonian Holstein dairy cows from 14 herds was analysed for the impact of the first calving interval length (CI<sub>1</sub>) on milk yield (MY) and lactation persistency. The results show that cows with CI<sub>1</sub> shorter than 12 months have on average 2 345 kg lower milk yield in the first 1 000 days of productive lifetime than those with CI<sub>1</sub> between 14 and 16 months. This is caused by lower MY in both the first and the second lactation as well as higher probability of being culled before reaching 1 000 days of productive life.

Effect of different calving classes in the first calving on subsequent milk production in Holstein dairy cows

2009 ◽  
Vol 2009 ◽  
pp. 132-132
Author(s):  
A Heravi Moussavi ◽  
M Danesh Mesgaran
Keyword(s):  
Risk Factor ◽  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Pregnancy Loss ◽  
Dairy Farms ◽  
Reproductive Efficiency ◽  
The Impact ◽  
Holstein Dairy Cows

Revenue from dairy farms is directly dependent upon reproductive efficiency because it affects milk production and the number of calves born (Thurmond et al., 1990). Pregnancy loss can have devastating effects on economical success in dairy farms. Normal annual abortion risks have been cited to be 3–5%, once cows are beyond 42 days of pregnancy (Hovingh, 2002), or similarly an observable 2–5% in most dairies (Kirk, 2003). Although, there is little or no indication that milk production is a risk factor for increased pregnancy losses in dairy cattle (Santos et al., 2004), there is little information on the effect of pregnancy losses on subsequent milk production. The aim of this study was to evaluate the impact of different calving classes including eutocia, dystocia, stillbirth and abortion in the first calving on subsequent milk production in Iranian Holstein dairy cows.

scholarly journals RELATIONSHIP BETWEEN RETAINED PLACENTA AND BODY CONDITION CHANGES DURING THE TRANSITION PERIOD IN HOLSTEIN DAIRY COWS IN NORTH-EASTERN ALGERIA

SPERMOVA ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 17-23
Author(s):  
Ahmed Hadef ◽  
◽  
Kamel Miroud ◽  
Hocine Sebihi
Keyword(s):  
Dairy Cows ◽  
Body Fat ◽  
Body Condition ◽  
Transition Period ◽  
The Body ◽  
Retained Placenta ◽  
North Eastern ◽  
Eastern Algeria ◽  
The Impact ◽  
Holstein Dairy Cows

Retained placenta (RP) is a common complication of bovine parturition. It is a multifactorial reproductive disorder that predisposes to infection and hence, to infertility. The impact of body condition changes during the transition period on the risk of RP appearance was evaluated in 12 Holstein dairy cows calving from October to January in north-eastern Algeria. The animals were body condition scored (BCS) 3 weeks antepartum and two weeks postpartum to assess the peripartum body fat loss (BCS loss). The statistical analysis involving variables related to BCS and parity was performed using the principal component analysis (PCA). An RP critical occurrence of 41.66% exceeding significantly the threshold prevalence of 10% (p<0.05) was recorded. This could be related to the BCS loss that exceeded one unit over the transition period (r=0.84, p<0.01), expressing the high body fat mobilisation in response to stressor factors such as negative energy balance, feed availability and climatic condition. Scoring the body condition, particularly around the peripartum, may serve as a tool to monitor the risk factors related to the energetic status of dairy cows.

scholarly journals Metabolomics Approach Explore Diagnostic Biomarkers and Metabolic Changes in Heat-Stressed Dairy Cows

Animals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1741
Author(s):  
Shuangming Yue ◽  
Siyan Ding ◽  
Jia Zhou ◽  
Chao Yang ◽  
Xiaofei Hu ◽  
...  
Keyword(s):  
Blood Plasma ◽  
Dairy Cows ◽  
Milk Production ◽  
Low Density Lipoprotein ◽  
Plasma Concentrations ◽  
Density Lipoprotein ◽  
Plasma Metabolites ◽  
Low Density ◽  
The Impact ◽  
Holstein Dairy Cows

In the present experiment, we investigated the impact of heat stress (HS) on physiological parameters, dry matter intake, milk production, the metabolome of milk, and blood plasma in lactating Holstein dairy cows. For this purpose, 20 Holstein lactating cows were distributed in two groups in such a way that each group had 10 cows. A group of 10 cows was reared in HS conditions, while the other group of 10 cows was reared in the thermoneutral zone. The results of the experiment showed that cows subjected to HS had higher respiration rates (p < 0.01) and greater rectal temperature (p < 0.01). Results of milk production and composition explored that HS lowered milk production (p < 0.01) and milk protein percentage (p < 0.05) than cows raised in a thermoneutral place. Furthermore, HS increased the concentrations of N-acetyl glycoprotein, scyllo-inositol, choline, and pyridoxamine in milk, while HS decreased the concentrations of O-acetyl glycoprotein, glycerophosphorylcholine, citrate, and methyl phosphate in milk. Moreover, HS enhanced plasma concentrations of alanine, glucose, glutamate, urea, 1-methylhistidine, histidine, and formate in cows, while the plasma concentration of low-density lipoprotein, very-low-density lipoprotein, leucine, lipid, and 3-hydroxybutyrate decreased due to HS. Based on the findings of the current research, it is concluded that HS alters the milk and blood plasma metabolites of lactating Holstein dairy cows. Overall, in the current experiment, HS altered eight metabolites in milk and twelve metabolites in the plasma of lactating Holstein dairy cows. Furthermore, the current study explored that these metabolites were mainly involved in proteolysis, gluconeogenesis, and milk fatty acid synthesis and could be potential biomarkers for dairy cows undergoing HS.

114 What Is the Impact of Dairy Influence Cattle on the Traditional Beef Industry Structure?

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 38-39
Author(s):  
Bradley J Johnson ◽  
Luke Fuerniss
Keyword(s):  
Dairy Cows ◽  
Dairy Herd ◽  
The United States ◽  
Reproductive Technologies ◽  
Industry Structure ◽  
Data Availability ◽  
Beef Production ◽  
Feed Conversion ◽  
Beef Industry ◽  
The Impact

Abstract The U.S. cow inventory includes approximately 31 million beef cows and 9 million dairy cows, so flow of cattle from dairies into beef production influences the traditional beef industry structure. Dairy-influenced cattle have historically entered the beef supply chain as cull cows and calf-fed Holstein steers. Culled dairy cows account for approximately half of the cows harvested in the United States annually. Fed steers and heifers of dairy influence are estimated to account for 15% of annual steer and heifer slaughter. Advancements in data availability, genomics, and reproductive technologies have enabled more precise selection of dairy replacement heifers and more pregnancies to be allocated to a terminal sire. Recently, the use of beef semen to breed dairy cows that are not desirable for producing replacement heifers has become more widespread. Beef-on-dairy calves are often moved to calf ranches shortly after birth where they are weaned and grown before transitioning to traditional grow yards or feedlots. In comparison to traditional range beef production, calves of dairy origin are weaned at a younger age, have more restricted mobility early in life, and are fed a delivered ration for a greater number of days. While carcasses of dairy-originated fed cattle excel in subcutaneous leanness and marbling, calves originating from dairies typically experience greater morbidity, poorer feed conversion, and poorer dressed yields compared to native fed cattle. Future opportunities to optimize beef production from the dairy herd include refining sire selection to consistently produce high quality calves, reducing variation in calfhood management, and identifying optimal nutrition and growth technology programs for calves from dairies.

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