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Showing 1 to 20 of 22 for “"Primiparous cows"”.
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Experimentally induced Escherichia coli mastitis in lactating primiparous cows
Escherichia coli (E. coli) is één van de voornaamste oorzaken van klinische mastitis bij hoogproductieve melkkoeien. De bacterie bezit geen specifieke virulentiefactoren met een rol in de pathogenese van de aandoening. De afweerreactie na experimenteel geïnduceerde E. coli mastitis werd reeds …
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Effect of once-daily suckling and parity on follicular dynamics in postpartum Brahman cows
… in forty-four Brahman multiparous (n=30) and primiparous (n=14) cows randomly assigned to control (n=22) and once-daily suckling (n=22) treatments. Daily transrectal ultrasonography images were taken from d 21 through 88 post-calving or detection of first estrus. Suckling treatment was …
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Intake capacity of the Icelandic dairy cow. Effect of animal factors, concentrate ratio and feeding method
… aiming at a 45% concentrate ratio (SF45). Primiparous cows fed TMR had significantly higher DMI than those fed SF45 (p<0.05), while there was no significant difference in the DMI between treatments for multiparous cows (p>0.1). Both primiparous and multiparous cows in the TMR treatments had …
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Effects of heat-stress-induced physiological changes on the productivity of dairy cattle
… glucose concentrations, and milk production in primiparous (n=26) and multiparous (n=27) Holstein cows. Glucose was measured in coccygeal vein blood twice weekly using a hand-held glucometer (Abbott Precision Xtra) from May through July. Rectal temperatures were also collected. The days …
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Field study of the effect of an anionic supplement on the incidence of hypocalcemia, clinical disease, production, and reproduction in early lactation in dairy herds
… a negative DCAD diet, including more than 1000 cows from 4 commercial farms. Close-up pens with cows 3 wk before calving were randomly assigned to a negative DCAD (TRT; -108 mEq/kg dry matter [DM]) or a control diet (+105 mEq/kg DM with a placebo supplement). The outcomes include blood Ca …
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Investigating the effect of dexamethasone on productivity, immune function, and behavior in dystocic periparturient dairy cattle
Dairy cows are increasingly predisposed to diseases in the periparturient time period due in part to immunosuppression. Dystocia amplifies the disease risk due to the increased tissue trauma and stress the animal endures during the lengthened parturition. To decrease the increased inflammatory …
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CHARACTERIZATION OF SENSOR AND NON-SENSOR COW, HERD MANAGEMENT, AND ENVIRONMENTAL DATA AND USE OF MACHINE LEARNING ALGORITHMS FOR PREDICTION OF PREGNANCY IN DAIRY CATTLE
… service (FS) after calving in lactating dairy cows. The specific objective of the study presented in Chapter I was to compare patterns of multiple cow behavioral, physiological, and performance parameters collected by automated sensors before insemination for cows that became pregnant or not at …
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Effects of energy-protein supplementation frequency on performance of primiparous grazing beef cows during pre and postpartum
… calving) and postpartum (105 d after calving) of primiparous beef cows on performance and metabolic characteristics under grazing conditions. Twenty-four pregnant Nellore primiparous cows with average BW of 409±8.0 kg, 22±0.9 mo old and 172±2.5 d of gestation were used in this trial. Treatments …
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Nutritional Management Strategies to Increase Energy Intake of Lactating Cows
… were evaluated utilizing 71 Holstein dairy cows (34 primiparous and 3 7 multiparous) in a total lactation trial. Cows were randomly assigned at parturition to 1 of 3 dietary treatment regimes: Control (CON = 50:50 forage: concentrate (F: C) first 100 d); increased caloric density from …
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Produção e qualidade do leite de vacas primiparas (alimentas) com diferentes níveis de ácido tânico
… to evaluate the milk production and quality of primiparous cows with the addition of increasing levels of tannic acid in the diet. The experiment was carried out in the cattle breeding sector, at the Agrarian Sciences Center of the Federal University of Paraíba, from February to May 2015, with a …
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Evaluation of 72 h Cosynch and 5 or 7 d post-AI gonadotropin releasing hormone on first service pregnancy rate in lactating dairy cows
… PR, plasma P4, and CL volume in lactating dairy cows synchronized using 72 h Cosynch. All cows were synchronized and randomly assigned to one of three treatment groups: Control – no additional GnRH; 5 d – GnRH 5 d after TAI; 7 d – GnRH 7 d after TAI. In the first study, P4 concentrations were …
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Canola Meal Replacing Dried Distillers Grains with Solubles in Diets for Lactating Dairy Cows
… with solubles (DOGS). Twelve lactating Holstein cows (four primiparous and eight multiparous) were fed in a 4 x 4 Latin square design with 4 wk periods. Data were collected wk 3 and 4 of each period. Diets were formulated with decreasing amounts of canola meal at 100, 66, 33 and 0% of the source …
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Protected Methionine and Heat-Treated Soybean Meal for High-Producing Dairy Cows
… as an amino acid source for high-producing dairy cows during wk 4 through 16 postpartum. Twenty-four Holstein cows (14 primiparous and 10 multiparous) were fed concentrate containing heat-treated· soybean meal without or with 50 g/cow/day of added ruminally protected methionine product which …
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Presynchronizing injections of prostaglandin F[subscript]2alpha[subscript] or prostaglandin F[subscript]2alpha[ subscript + Gonadotropin-releasing hormone before a fixed time artificial insemination CO-Synch + CIDR program in suckled beef cows
… and timed AI [TAI] on d 0) in suckled beef cows. This hypothesis was tested in 2 experiments, in which cows were treated with either PG or PG + GnRH before initiating a control CO-Synch + CIDR program to increase the proportion of cows starting the program in a low (< 1 ng/mL; Exp. 1) or …
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Evaluation of long-term CIDR-based estrus synchronization protocols in primiparous two-year-old beef cows
Reproductive management of two-year-old beef cows presents a unique challenge in managing a beef herd, since this age group of females typically experiences the highest incidence of reproductive failure. Strategic management of replacement beef heifers and primiparous cows is necessary to ensure …
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Metabolic, reproductive, and performance evaluation in primiparous Nellore beef cows under grazing with different ages at breeding
… reproductive and performance differences of primiparous Nellore cows, which became pregnant at 14 or 24 months. Thirty- eight primiparous Nellore cows with 200 ± 30 days of gestation were used, divided into two treatments: 14 - animals that became pregnant at 14 months of age, and 24 - …
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Fecal consistency as related to dietary composition in lactating Holstein cows
… in lactating cattle. In Experiment 1, 30 cows (12 multiparous, 18 primiparous) were randomly assigned to one of six total mixed diet treatments through four 21 d periods. For Experiment 2, six primiparous cows were used in two 6 x 6 Latin squares to evaluate water consumption, apparent …
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Replacing Corn and Soybean Meal in Lactating Dairy Cow Diets with Field Peas (Pisum Sativum)
… The experiment used 16 lactating Holstein dairy cows (nine primiparous and seven multiparous) in a 4 x 4 Latin square design with 28 d periods. Cows were blocked into squares by parity, current milk production, and DIM, where one square consisted of 4 ruminally canulated cows (three multiparous …
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Influência do manejo mãe-cria na eficiência reprodutiva de primíparas de raças de corte
A presente tese foi elaborada a partir de dois experimentos, um realizado nos Estados Unidos (durante dois anos consecutivos) e outro no Brasil, com o propósito de comparar os efeitos do desmame precoce com a remoção de bezerros por um curto período de tempo. O estudo relatado nesta tese focou na …
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Methods to Evaluate Protein Quality of Diets for Lactating Cows
<p>Ten multiparous and five primiparous cows (x= 62 ± 33 days in milk) were utilized in a replicated 5 x 5 Latin square design with 21-d periods to investigate the differences between three systems for evaluating dietary protein quality for lactating cows: a) milk protein score (MPS); b) Cornell …
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