دورية أكاديمية
Late gestational nutrient restriction in primiparous beef females: nutrient partitioning among the dam, fetus, and colostrum during gestation.
| العنوان: | Late gestational nutrient restriction in primiparous beef females: nutrient partitioning among the dam, fetus, and colostrum during gestation. |
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| المؤلفون: | Redifer CA; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Wichman LG; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Rathert-Williams AR; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA., Freetly HC; USDA, ARS, Roman L Hruska US Meat Animal Research Center, Clay Center, NE 68933, USA., Meyer AM; Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA. |
| المصدر: | Journal of animal science [J Anim Sci] 2023 Jan 03; Vol. 101. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Society of Animal Science Country of Publication: United States NLM ID: 8003002 Publication Model: Print Cited Medium: Internet ISSN: 1525-3163 (Electronic) Linking ISSN: 00218812 NLM ISO Abbreviation: J Anim Sci Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Champaign, IL : American Society of Animal Science |
| مواضيع طبية MeSH: | Colostrum* , Diet*/veterinary, Pregnancy ; Female ; Cattle ; Animals ; Animal Feed/analysis ; Parturition ; Fetus ; Nutrients |
| مستخلص: | Fall-calving primiparous crossbred beef females [body weight (BW): 451 ± 28 (SD) kg; body condition score (BCS): 5.4 ± 0.7] were allocated by fetal sex and expected calving date to receive either 100% (control; CON; n = 13) or 70% (nutrient restricted; NR; n = 13) of metabolizable energy and metabolizable protein requirements for maintenance, pregnancy, and growth from day 160 of gestation to calving. Heifers were individually-fed chopped poor quality hay and supplemented to meet targeted nutritional planes based on estimated hay intakes. Dam BW, BCS, backfat, and metabolic status were determined pre-treatment, every 21 d (BW and metabolic status) or 42 d (BCS and backfat) during gestation, and post-calving. At birth, calf BW and size were measured, and total colostrum from the most full rear quarter was collected pre-suckling. Data were analyzed with nutritional plane, treatment initiation date, and calf sex (when P < 0.25) as fixed effects. Gestational metabolites included day and nutritional plane × day as repeated measures. During late gestation, CON dams gained (P < 0.01) maternal (non-gravid) BW and maintained (P ≥ 0.17) BCS and backfat, while NR dams lost (P < 0.01) maternal BW, BCS, and backfat. Circulating glucose, urea N, and triglycerides were less (P ≤ 0.05) in NR dams than CON at most late gestational timepoints after treatment initiation. Circulating non-esterified fatty acids were greater (P < 0.01) in NR dams than CON. Post-calving, NR dams weighed 63.6 kg less (P < 0.01) and were 2.0 BCS less (P < 0.01) than CON. At 1 h post-calving, NR dams had less (P = 0.01) plasma glucose and tended to have less (P = 0.08) plasma triglycerides than CON. Nutrient restriction did not affect (P ≥ 0.27) gestation length, calf birth weight, or calf size at birth. Colostrum yield was 40% less (P = 0.04) in NR dams than CON. Protein and immunoglobulin concentrations were greater (P ≤ 0.04), but free glucose and urea N concentrations were less (P ≤ 0.03), in colostrum of NR dams than CON. Colostrum total lactose, free glucose, and urea N were less (P ≤ 0.03) in NR dams than CON, but total protein, triglycerides, and immunoglobulins were not affected (P ≥ 0.55). In summary, beef heifers experiencing late gestational nutrient restriction prioritized partitioning nutrients to fetal growth and colostrum production over maternal growth. During undernutrition, fetal and colostral nutrient demands were largely compensated for by catabolism of maternal tissue stores. (© The Author(s) 2023. Published by Oxford University Press on behalf of the American Society of Animal Science.) |
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| معلومات مُعتمدة: | 2017-67015-26587 USDA National Institute of Food and Agriculture, Agriculture and Food Research Initiative |
| فهرسة مساهمة: | Keywords: beef heifer; developmental programming; fetal growth; metabolites; pregnancy Local Abstract: [plain-language-summary] Nutrient requirements increase substantially during late gestation in the beef female. Even in well-managed herds, it is possible for females to be nutrient restricted during this time due to challenges of poor forage quality or availability and environmental stress. For heifers, the added nutrient requirements needed to continue growing pose an even greater challenge during their first pregnancy. However, little is known about how late gestational undernutrition impacts nutrient partitioning between maternal growth, the developing offspring, and colostrum production in beef heifers. Our data show that late gestational nutrient restriction in heifers slowed the expected maternal growth and instead maternal tissue stores were catabolized. Less nutrients were available in the maternal circulation, yet calf weight and size at birth were not affected. Late gestational nutrient restriction resulted in less colostrum produced by the dam and less lactose available to the offspring, but the total protein, fat, and immunoglobulins available in colostrum were not altered. In summary, beef heifers experiencing late gestational nutrient restriction prioritized partitioning nutrients to fetal growth and colostrum production over maternal growth and maintenance of body condition. |
| تواريخ الأحداث: | Date Created: 20230614 Date Completed: 20230807 Latest Revision: 20230822 |
| رمز التحديث: | 20231215 |
| مُعرف محوري في PubMed: | PMC10400126 |
| DOI: | 10.1093/jas/skad195 |
| PMID: | 37314299 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1525-3163 |
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| DOI: | 10.1093/jas/skad195 |