Effect of Phosphorus Supplementation on Growth Rate, Blood Minerals, and Conception Rate of Dairy Heifers

Noller, C. H.; Castro, Andrés; Wheeler, William E.; Hill, Davina L.; Moeller, N. J.

doi:10.3168/jds.s0022-0302(77)84125-8

Cited by 15 publications

(13 citation statements)

References 3 publications

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“…Several other studies have also showed no effect of dietary P on reproduction [14,21,24]. Noller et al [25] reported similar reproductive performance in cows fed 0.22 or 0.32% P. Call et al [11] reported that feeding diets containing 0.24, 0.32, or 0.42% P in their 12-month trial did not affect reproductive performance. In many parts of the world, dairy producers feed high dietary P to cows with the belief that P can improve reproductive performance [4]; however, our results indicate that reducing dietary P to the amounts recommended by the NRC [2] or the Chinese feeding standard [6] would not affect animal health or reproductive performance.…”

Section: Resultsmentioning

confidence: 99%

Effect of dietary phosphorus content on milk production and phosphorus excretion in dairy cows

Wang

Liu

Wang

et al. 2014

J Animal Sci Biotechnol

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BackgroundPhosphorus (P) supplementation is costly and can result in excess P excretion. This study investigated the effects of reducing dietary P on milk production and P excretion in dairy cows over a full lactation.MethodForty-five multiparous Holstein dairy cows were divided into 15 blocks according to expected calving date and previous milk yield, and assigned randomly to one of the three dietary treatments: 0.37, 0.47, and 0.57% P (DM basis); these P levels represent the NRC recommendations, Chinese recommendations, and the amount of dietary P commonly fed by Chinese dairy farmers, respectively. Average daily feed intake was calculated from monthly data on feed offered and refused. Milk yields of individual cows were recorded weekly, and milk samples were taken for analysis of protein, fat, solids-not-fat, lactose, and somatic cell count. Blood samples were collected on days −6, −3, 0, 3, 6 relative to calving, and then monthly throughout lactation, and analyzed for P and Ca concentrations. Spot samples of feces and urine were collected for 3 consecutive d during weeks 12, 24, and 36, and P concentrations were analyzed. Reproduction and health data were recorded.ResultsDietary P did not affect dry matter intake or milk yield (P > 0.10). Milk fat content was slightly higher in cows fed 0.37% P than in cows fed 0.47% P (P = 0.05). Serum concentrations of P and Ca did not reflect dietary P content (P > 0.10). Fecal and urinary P both declined linearly (P < 0.05) as dietary P decreased from 0.57 to 0.37%. Fecal P content was 25% less when dietary P was 0.37% compared to 0.57%. Health events and reproductive performance were not associated with dietary P content (P > 0.05).ConclusionsLowering dietary P from 0.57 to 0.37% did not negatively affect milk production, but did significantly reduce P excretion into environment.

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Section: Resultsmentioning

confidence: 99%

Effect of dietary phosphorus content on milk production and phosphorus excretion in dairy cows

Wang

Liu

Wang

et al. 2014

J Animal Sci Biotechnol

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“…The NRC (2001) P requirements for dairy heifers were assimilated from the Agriculture and Food Research Council (1991) and are the sum of absorbed P required for maintenance, growth, and pregnancy divided by the absorption coefficient(s) for dietary P. The dietary P requirement for dairy heifers (NRC, 2001) typically ranges from 0.20 to 0.35% of dietary DM and endogenous levels of P in feeds (0.20-0.35% of DM) are similar, suggesting supplemental P in heifer diets may be minimally required. Noller et al (1977) demonstrated that supplementing P at 0.10 percentage units above the endogenous P content (0.22% of DM) in feedstuffs had no effect on dairy heifer growth or reproductive performance. Hurley et al (1982) reported no negative effects of feeding 0.19 percent dietary P to dairy heifers on estrous behavior or endocrine function.…”

Section: Introductionmentioning

confidence: 95%

“…Heifers were fed diets containing no supplemental P or supplemented with monosodium phosphate to increase dietary P by 0.10% of DM. Dietary treatments for the long-term P feeding study were similar to Noller et al (1977) but the study differed in 3 ways. First, treatments were initiated when heifers were 4 mo of age and treatment diets were fed for the entire growth period (±600 d) compared with 238-and 364-d feeding periods utilized by Noller et al (1977).…”

Section: Introductionmentioning

confidence: 99%

“…Dietary treatments for the long-term P feeding study were similar to Noller et al (1977) but the study differed in 3 ways. First, treatments were initiated when heifers were 4 mo of age and treatment diets were fed for the entire growth period (±600 d) compared with 238-and 364-d feeding periods utilized by Noller et al (1977). Second, large numbers of heifers (n = 365) were assigned to the study to provide statistical inference regarding reproductive efficiency, parturient metabolic disorders, and future milk production, which were not evaluated by Noller et al (1977).…”

Section: Introductionmentioning

confidence: 99%

“…First, treatments were initiated when heifers were 4 mo of age and treatment diets were fed for the entire growth period (±600 d) compared with 238-and 364-d feeding periods utilized by Noller et al (1977). Second, large numbers of heifers (n = 365) were assigned to the study to provide statistical inference regarding reproductive efficiency, parturient metabolic disorders, and future milk production, which were not evaluated by Noller et al (1977). Third, the extent of bone growth, bone composition, and bone metabolism of dairy heifers were evaluated, which have not been evaluated in other P feeding studies conducted with dairy heifers.…”

Section: Introductionmentioning

confidence: 99%

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The effect of dietary phosphorus on bone development in dairy heifers

Esser

Hoffman

Coblentz

et al. 2009

Journal of Dairy Science

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Phosphorus requirements, as percent of dietary dry matter for heifers (0.20-0.35%) and endogenous levels of P in feeds (0.20-0.35% of dry matter) are similar, suggesting that supplementation of P in heifer diets may be infrequently required. Because long-term studies are unavailable, 183 Holstein heifers and 182 Holstein x Jersey crossbred heifers were fed diets with (0.39%) and without (0.29%) supplemental P from 4 to 21 mo of age in a replicated pen design. Two subpopulations of heifers were selected mid-trial for intensive measurement of bone development and metabolism. Thirty-two heifers at 628 d (+/-10.0 d) of age, balanced by breed and diet, were evaluated for bone development. External frame measurements included hip height, length, heart girth, hip width, cannon bone circumference, pelvic length, pelvic height, and pelvic width. Tails of heifers were surgically amputated with the 13 and 14th coccygeal vertebrae retained. After tissue removal, the 13th coccygeal vertebrae were scanned using peripheral quantitative computed tomography with cortical, trabecular, and total bone densities determined. A second subpopulation (n = 64) of heifers (375 d +/- 33 d), balanced for breed and diet, were evaluated for serum pyridinoline and osteocalcin to assess systemic bone metabolism. Data were analyzed as a completely randomized design with breed, treatment, and their interaction in the model. External skeletal measurements revealed significant differences in hip height, hip width, heart girth, cannon bone circumference, and pelvic length between Holstein and crossbred heifers. Supplementing P had no effect on external frame measurements, bone density, or bone metabolism markers. Bone P content was lower (18.1 vs. 18.6%) in heifers fed no supplemental P. Data suggest P supplementation to heifers modestly increased bone P content but increased bone P was not reflected in frame growth, bone density, or bone metabolism.

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Effects of concurrent deficiencies of phosphorus and copper in growing lambs on the concentration of minerals in tissues

Abdelrahman

Kincaid

1992

Small Ruminant Research

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Effect of Phosphorus Supplementation on Growth Rate, Blood Minerals, and Conception Rate of Dairy Heifers

Cited by 15 publications

References 3 publications

Effect of dietary phosphorus content on milk production and phosphorus excretion in dairy cows

Effect of dietary phosphorus content on milk production and phosphorus excretion in dairy cows

The effect of dietary phosphorus on bone development in dairy heifers

Effects of concurrent deficiencies of phosphorus and copper in growing lambs on the concentration of minerals in tissues

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